Windows 10 Mobile marches on, regardless of the critics and ne'ersayers. Still seemingly on an approximate fortnightly update schedule (here's the previous), the 'Fast ring' Insiders have a new build to play with, 14951. Don't get too excited though, most of the functional changes are to do with the PC. Plus there are some significant issues for Mobile (if you can update at all!) - you might want to consider skipping this particular build. As they say in discographies for obscure albums, "one for completists only"?

From the Microsoft post, referring to the Camera update that I spotted a few days ago:

Today we are excited to be releasing Windows 10 Insider Preview Build 14951 for Mobile and PC to Windows Insiders in the Fast ring.

Simplified, more familiar camera interface (PC & Mobile): The Camera app received a big update this week for Insiders. We’ve redesigned the Camera interface for ease and accessibility. Check out some of our new features:

• Enjoy taking photos, videos, and panoramas with our higher-contrast capture buttons.
• Set a photo timer right from the camera dashboard with our new toggle control.
• Get to Settings faster! Now, launch into Settings directly from the camera UI.
• Access your camera roll with one hand from its new spot on the screen.
• Zoom more easily with the new zoom slider.
• Make sure you nailed the shot, with a more noticeable capture animation.
• Change between front- and rear-facing cameras with a more prominent button control.
• On PC, use the spacebar as a shortcut to take pictures.

And this release features a variety of performance improvements to enhance your experience. We’ve added faster shot-to-shot support, improved feedback for saving large videos to SD cards, and improved camera startup time, among other improvements.

Other improvements and fixes for Mobile

• Following feedback discussing French punctuation rules, we’ve updated our French keyboards (with the exception of French (Canada), for which these rules don’t apply) to now add a space both before and after when using two-part punctuation marks, such as the semi-colon, the colon, the question mark and the exclamation mark.
• We fixed an issue resulting in the Camera shutter sounds entry missing from the Sounds Settings page via Settings > Personalization > Sounds.

Known issues for Mobile

• Signing into apps such as Feedback Hub, Groove, MSN News, etc. with your Microsoft Account if you sign out or get signed out of these apps will not work. If this happens to you and you cannot sign in to Feedback Hub, you can send us feedback via the forums.
• When rebooting a phone on this build and Build 14946 from last week, the device appears to get “stuck” on the blue Windows logo screen during the boot cycle. We have identified 2 bugs causing this issue and working to check in fixes soon. However, being “stuck” is only temporary. Depending on which device you have, your phone may be in this stuck state for 20-30 minutes, but it will eventually progress to the Lock screen. There is no permanent impact from these 2 bugs, just an unexpectedly long boot time. Please don’t reset your device! It’ll take longer to reset the device than it will to wait for the boot cycle to complete.
• Excel Mobile will freeze after adding sheets and eventually crashes.
• Insiders who have configured a data limit on their phone may get into a state where they receive frequent notifications about having exceeded this limit. To resolve the issue, please go into Settings > Device & Network > Data Usage and remove and recreate your data limit settings.
• UPDATE: We are investigating reports of devices getting stuck at 0% while downloading this build. For more information – head over to this forum post.

Some whoppers in there then. I'd advise not to update and to wait for another update in a fortnight's time if you depend on this particular handset day to day. Hey, this is still early in Redstone 2's life-cycle, Fast ring Insiders should expect a few slightly broken builds along the way.

Of course, in the fulness of time we'll need a summary of what's new going from Redstone to Redstone 2, but we won't have a full feature set or changelog for a while yet - this mobile OS has got legs, even if the number of licensees isn't overwhelming. Settle down for the long haul, everyone....!

Anyone with an existing phone that's officially deemed Windows 10 Mobile compatible by Microsoft can join in the fun. The full list of phones includes Lumia 430, 435, 532, 535, 540, 635 (1GB RAM version), 640, 640 XL, 730/735, 830, 930, 1520, Icon, BLU Win HD w510u, BLU Win HD LTE x150q, and the MCJ Madosma Q501. Plus, of course, all the devices which have shipped with Windows 10 Mobile in the last year, of which the Lumia 550, 650, 950, 950 XL, Acer Jade Primo and HP Elite X3 are the highest profile.

In each case:

1. Upgrade to Windows 10 Mobile (if appropriate) using the Upgrade Advisor.
2. After at least one update cycle you should then be on the Anniversary Update (a.k.a. Redstone). Head into Settings/Update & Security/Windows Insider Programme
3. Join the Insiders programme and choose the 'Fast' level in the pick list.
4. Within a few hours your phone should be seeing the build mentioned above and you'll be running next year's mobile OS today. Fun, fun, fun....!