The update is to the recent Ubuntu Gnome 16.04 beta, this one can be called Beta 2. It still features the Gnome 3.18 desktop and no word on when the 3.2 desktop will be arriving, although it was released on March 23rd.
As said previously Ubuntu GNOME 16.04 LTS Beta 2 had fixed the Sharing panel in GNOME Control Center.
The biggest news with the update is that Ubuntu GNOME 16.04 LTS now uses the GNOME Software as default graphical package manager instead of Ubuntu Software Center, and the GNOME Calendar and GNOME Logs applications have been installed by default.
Although the Beta 2 is available as of right now, there are many known bugs and problems associated with the program right now. No word on when updates and fixes will be rolling out.