I'd honestly be fine with it being a bit colored and sweet. The higher end stats (007 & 009) have the analytical bit covered and a nice smooth (great sounding) can would be awesome.
If they're trying to follow in the HE60/90's footsteps I'd imagine that's where they'll go. Looks wise...the HE90 is one of the most gorgeous headphones ever made, IMO.
The aesthetics of the HE90 is quite impressive especially through the driver protective grill. How about using a real leather this time around? My HE90's pleather pad is flaking as we speak. I wish jmoney came through with their leather HE90 earpads, sadly the project never did materialized.