Hello,
I live in France and I have just updated my F900BT. No problem during the update process (1.001600 to 1.001900)
I don't know the official changes, but in my opinion, the system is more responsive. I've seen no other changes.
Boot time is 45 sec until the menu appears, 60 sec until I can use it.
PS : Before the update my bluetooth and audio/video with my iPhone V1 (2.0) was working and... it works as well with the update