Unless you absolutely adore subtle differences in menus, buttons, checkboxes and dialog layouts , this could be considered the most boring beta release yet.
Ubuntu MATE 16.10 is setting up a new foundation for the future of the distro with the move to GTK 3.
GTK... what's that?
GTK is a library for presenting your graphical user interface, There will be some subtle differences in appearance and behaviour, but will still be the same MATE Desktop.
The Heads-Up Display (HUD) that was planned has been postponed to 17.04 due to some serious issues.