It has indeed for me fixed the delay issue over ML.
Make sure you have the latest software for DSM module and a hardware DSM version above 1.5 i believe without the document in front of me.
( i will clarify in an hour when i get home)
In the customer service menu there is an option called ML delay and that fixes the problem and i no longer need anologue cables connected for sound, i can also get sound from SKY HD which i coudl not before as it was only connected via HDMI.
I believe the sound in link rooms is now the digital sound sent over the ML rather than the Anologue sound over ML.
p.s
Please be aware my experiance is only via link room audio and not video, but i believe that was fixed also by using AV command.
If you need a copy of the requirements for the ML delay option to appear let me know.
Beovision 7 MKIV (Blu Ray)
Beolab 9
Beolab 6000
Beo 4
Beocenter 9300
Apple TV
SKY HD
Optoma HD65 Projector
Lintronic TT455-RT-238
Beovision 3 MKII