I have just done this up-date on my 2011 X3.
I was one of the people who couldn't use the call answer button on the 'wheel to answer the first call to come in after Bluetooth connection had been made (iPhone 3gs) this was very inconvenient for me as I am in and out of the car all day. Well, having done the up-date I made a test call from home phone to iPhone and was able to answer it first time off the button on the 'wheel, so I'm happy
However, I must say that as my car was at the dealer last week for a service I would have thought that the software would have been updated to the latest version automatically then.