If I were interested in this card (or 2) and wasn't going to water cool it (them), I'd wait for the Asus Cu2 or, if Sapphire do it, the Toxic w/Accelero Xtreme, like they did with the 5970 Toxic (IMHO the best 5970 ever made.). For Crossfire, w/o water cooling, you're going to need 3 slots between your pci slots. All of this needs to be considered, cost wise, before upgrading.
I see this as a completely different direction for AMD. Might explain the turn over in upper management? I can't imagine Dirk going in this direction. I would rather have seen them spend the money engineering a single 1920 Cayman with a wider mem bus and compete for the single GPU crown at <300W, and then just let people buy 2, if that's what they need.
This card reminds me too much of the original Fermi, too hot and too loud (Except originally Fermi couldn't even yield fully functioning chips.). nVidia learned from that mistake and has gone to great lengths to correct it. We do need to consider though that Cayman was designed with a shrink in mind and AMD has to work with the cards they're dealt right now.