Microsoft has released the April update for Xbox consoles, including the Xbox Series X|S and Xbox One, as well as for the Xbox app on smartphones. As usual, this update brings a few new features, starting with the mobile app, which is finally getting widespread support for achievements. Microsoft announced it was rolling out this feature gradually last month, and everyone should have it by the end of April. You'll also be able to compare you achievements with your friends and see monthly leaderboards to compare against them.
Over on Xbox consoles, this update brings some improvements for Game Pass subscribers. For starters, you'll now see a section called Play with Friends, which lists Game Pass games that are being played by your friends and lets you jump in and join them. Game Pass is also getting new game recommendations, for those times when you can't decide what to play next. These recommendations are based on games you've played before, so it could make it easier to find something you like.
Microsoft is also making improvements to game downloads. If you're downloading a game and playing something else at the same time, your console can now let you know if that game is impacting your download speed, and give you the option to suspend it so you can download faster.
As for known issues with this release, not a whole lot has changed, though Microsoft has removed issues related to the Xbox Series X|S controller and FPS Boost from the list, so presumably, those things are working fine now. You should be able to download the update now, but it will also install automatically sooner or later.