I just had my 06' 750li at the dealer on the 19th of Dec for the soft door recall and while it was there the stealership said that they would check my software for the latest versions. so here is what I came away with.
CD CHANGER: 6.3.38
AMFM TUNER: 6.8.B
SPEECH REC: 7.F.1
MM CHANGER: ----
As far as I know theses are the latest up dated versions...(according to the stealer-ship) I hope this info helps....