I just picked it up...as reported UI is nicer, it seems a bit faster- not much. A few little improvements like:
1. Map stays up when restarting car (dont have to go back thru menus)
2. POI search now
3. Audio sources now go instantly to source, no need to enter "play"
4. Arrow pops up when navigating on smaller screen (but this does not work when nav is selected in HUD)
5. Route line on map is now much clearer
6. Bluetooth connects faster

BTW-
The tech stated he installed ver 25.2 (I asked twice)
RTTI is working, Voice Command is working, evertyhing works great and it was installed in one day.

All my settings are intact, except the 6 preset buttons for the IDrive, they are all gone.

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2013 X5 35i M Sport