What I can say is what you can expect.
- A completely redesigned app running in 720P (the old one was in 540P)
- Supports "Home" and fast user switching.
- Support Trailers and Extras.
- Supports Playqueue and Playlists. Now you can play thousands of files in a row. (No playlist creation yet, only playback)
- This version has a gridview. This was something requested many times.
- The grid also supports filtering and sorting.
- A fancy looking preplay screen, where you can still change your settings like before, only nicer.
- The app is now "single server". This means that the app will look and work the same for remote content as for local. Shared Content is gone.
- You can now switch to a different server right from the home screen. Of course with applied security based on who is logged in.
- A new full screen music player, that will show you the artist background while playing music.
- Smart controls are now supported. Just point and click on what you want to do.
- A new High resolution Slideshow for photos, up to UHD quality if you have the hardware. Also comes with new transition effects.
- Menu sorting, always a hot topic. Now you can set it to Alphabetic or Grouped by type.
- Many overhauled features
If you really can't wait to see it, you can download the new manual right now. (it's on Dropbox, so limitations on downloading may occur)
A side note: This version will only run on 2012 or higher models.