The only other feature added, that I'm aware of, has to do with the status bar lock feature.
They previously added the ability to "lock" the status bar, at the bottom of the screen, for when you're playing games, or watching movies, and don't want to accidentally tap on the notification bar, for example. This was added a while back. (great option, by the way)
In the latest update, if you go into settings, it now allows you to have status displayed while dock is locked, so that it will display, for example, wifi status, bluetooth status, battery status, on the dock, while locked, or it will hide all information.
Bigger change, from my experience, is that the Prime now has improved Wifi connection, but that's not an added feature.
Those are the only two added features I'm aware of. If other people know of any other added features, hopefully, someone will chime in.