Yup, it's out of beta and fully official, updating users (ok, ok, just W10M Insiders, by definition, at the moment) via the Store as usual. Just as I predicted a week ago. Facebook v10(.1), the next-gen rewrite of this essential social client, is now fully available. You can remove the 'beta' version from your phone and, in fact, you might as well remove the non-beta version as well and re-install from the Store, since it'll force a re-login and resync anyway.

UPDATE: Microsoft seems to have pulled this for bug-fix reasons. Ahem. No doubt it will appear again shortly!

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From my previous story:

Facebook has been a staple on Windows Phone for years, with full integration into People on the platform and with a relatively fast and fluid client. Yet its origins in a world of WVGA led to a design that looked out of place on the higher resolution screens of today, which is why a rewrite that works much better on larger hardware was needed. The existing client for WP and W10M is v8.3.7.0, but the new beta of Facebook v10, after a number of false starts, now seems to be widely available and heading for official status, probably within the month.

If you have a device with a 1080p screen (e.g. Lumia 930 or 1520) then the difference is huge in terms of how the screen is used and the size of fonts and controls. Devices with a 720p or 768p screen, i.e. the majority, won't see such drama, but menus and functions still look cleaner, plus you're getting to play with the next generation of the client. 

I've never been a huge Facebook user, but I do dip into it now and then. And this v10 client is much cleaner and more capable, at least on the bigger screens of new and current devices. Grab it in the Store here.