As far as we have been told virtually nothing. Grill attachements changed, binding posts were changed, some layout on the crossovers most likely changed(based on what I have seen from my M22Ti to the V2's) but nothing to change the way they sound.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70