From the Microsoft post:
Today we are releasing Windows 10 Insider Preview Build 14291 for both PC and Mobile to Windows Insiders in the Fast ring. There are some very cool new things in this build, including one of the top requested features by Windows Insiders – extensions for Microsoft Edge!
Earlier today, we began the roll-out of Windows 10 Mobile to select Windows 8.1 phones. As we stated previously, devices which are eligible to receive Windows 10 will also be able to get preview builds from the Development Branch. We’ve already delivered a few builds to the devices which shipped with Windows 10, including the Lumia 550, 650, 950, 950 XL, Xiaomi Mi4, and Alcatel OneTouch Fierce XL. We have updated the list of devices that will be capable of receiving updates as part of the Windows Insider Program going forward, and in the coming weeks we will deliver Windows 10 Mobile Insider Preview builds from our Development Branch to these devices in the Fast ring.
On with what's new in build 14291.1001, anyway:
Extensions in Microsoft Edge: Today we are very excited to introduce extensions for Microsoft Edge. To try out an extension, just click on “More” (…) at the top right in Microsoft Edge and click “Extensions” to open the Extensions pane and click “Get extensions”. You can try out the Mouse Gestures, Microsoft Translator and Reddit Enhancement Suite extensions today with more on the way. Extensions are only available on PC. For more information on extensions for Microsoft Edge, check out this blog post from Drew.
Pinned Tabs in Microsoft Edge: Microsoft Edge now lets you pin tabs, making it super easy to keep your most-used sites and web apps always available. To pin a tab, right-click on the tab you want to pin and choose “Pin tab”. To unpin a tab, right-click on the pinned tab you want to unpin and choose “Unpin tab”. Pinned tabs always appear at the start of the tab row, and only showing the site’s favicon. Pinned tabs don’t show a close button, so you won’t accidentally close them. Pinned tabs that are in your Microsoft Edge window when you close the app will come back the next time you open Microsoft Edge.
Other Microsoft Edge Improvements: You can now copy any link into your clipboard, and right-click on the address bar in Microsoft Edge and choose “Paste and go” from the context menu. Microsoft Edge pastes the URL into the address bar, and navigates to the site. You can also copy words to your clipboard, and choose “Paste and search”.
We have also made it easier to close tabs in Microsoft Edge on your mobile device, especially on devices with a larger screen size by increasing the size of the close button for tabs on the Tabs page.
Of particular interest to me were major improvements to Windows 10 Maps - again, I'll have more on this in a separate Flow story and a future feature:
Updated Maps app: This build includes a updated Maps app for Windows 10 that brings a more lightweight, scalable, and consistent UI as well as underlying architecture improvements and new features for you to try!
And on with the 'What's new':
Updated Alarms & Clock app: We have pushed out an update to the Alarm & Clock app that introduces a new inline time picker and improved design for creating and editing alarms and timers...
Introducing Feedback Hub: As we announced last week, we are bringing together the Insider Hub and Windows Feedback apps into a single app called the Feedback Hub. And the Feedback Hub is now available in this build for both PC and Mobile. The Feedback Hub carries over all of the best things from the previous two apps plus a few new things. When you open Feedback Hub for the first time, you will see a search box at the top so you can quickly find and upvote feedback items from other Insiders or submit new feedback. You will also notice that Announcements and Quests show up together in a single feed under “What’s new”. When you submit new feedback to us, we have added a new description field so you can explain in more detail the feedback you are sending to us. The most helpful feedback for us includes a brief title that summarizes your feedback, then you can use the new description field to provide more detail, for example: the steps that an engineer could take to recreate a problem, or more information about a feature suggestion. And you’ll start seeing Microsoft engineers leaving comments on your feedback too! The familiar experience for browsing feedback is still a click away, just navigate to the Feedback tab from the left-hand navigation menu...
There's also a short list of fixed bugs in Windows 10 Mobile (several of which have been a pain on the 10586 branch, as many readers will know):
- We fixed the issue where connectivity to older Wi-Fi networks using the WEP encryption security method may be broken.
- We fixed an issue resulting in slower text input speed the more words were typed.
- We have improved Word Flow recognition of longer words.
- The All apps list has been updated to now follow the “Make Text Larger” ease of access setting.
- We fixed an issue where Settings would sometimes list unresolved app names under Extras.
- We fixed an issue where touch targets could be out of alignment in the Photos picker.
Plus there are some known issues to be aware of:
- If you reset your phone on this build (Build 14291) and restore your phone from a backup, restore will fail to install apps from your backup’s apps list leaving blank grey titles on Start. If you delete the grey tiles and attempt to reinstall the same apps from the Store, you will not get app data restored. The next backup will over-write the app backup data as well. To avoid hitting this bug, avoid resetting your phone on this build. If for some reason you do need to reset your device on this build, don’t restore your phone from a backup and you should turn off backup for apps and OS data to avoid creating a corrupt backup via Settings > Update & Security > Backup.
- If you have a Microsoft Band 1 or 2 paired to your phone, it will no longer sync after updating to this build due to a system API failure that occurs after the update. If you want to get your Band syncing with your phone again – you can temporarily change the language of your phone as a short term workaround until we release a fix. Additionally, you can also choose to reset your phone to get out of this state – however you may experience this update issue again with the next build until we fix this issue. This issue may also impact Skype video and audio calls.
- The Gadgets app will not detect the Microsoft Display Dock on phones running Windows 10 Mobile Insider Preview builds, and thus cannot update the firmware version. If you have a dock which has already been updated to version 4 then this will not affect you. If you have a dock that has not been updated, then you may experience some minor issues with USB-C stability. You will still be able to use your dock and Continuum.
- There is a new option under Settings > Update & security for Windows Insider Program. This is a work-in-progress option to improve managing your Windows Insider Program settings on your device. Right now, if you go to this option it crashes the Settings app. Please continue to use the Windows Insider app to manage your settings for now.
Which all sounds fine, at least for such an early Insiders release for this, the Redstone branch of Windows 10 Mobile. More later, despite the known issues I'm going to try living with this as my main phone/OS for a while and see how I get on.
If you want to experiment with Redstone too, you can soon jump on this branch if you have any of the known Windows 10-compatible phones, by installing the 'Windows Insider' utility and picking the 'Fast' ring. Just bear in mind that it's a one-way street, at least in terms of backups, you're looking at a reset and rebuild if you end up rolling back to the 'Threshold' (10586) branch. As I write this, only the Windows 10-native phones (e.g. 950, 650) are provisoned, but many other handsets are expected to be allowed to join in the fun, perhaps as early as the next build.