It's pretty widely speculated that Hainan (Pitcairn successor) will have 1,792 stream processors; 112 TMUs, 32 ROPs and 256-bit memory bus with clocks in the 1000+(core) /1500 (memory) range. That aside, do you believe this will see a release before H2 2013, which is when Curacao (Tahiti successor) is speculated to hit the market?
I speculate that the Malta HD 7990 will use Hainan rather than Tahiti as it requires only two 8-pin power connectors vs three for the custom model HD 7990s. Since it's supposedly far more power efficient than Tahiti due to the reworked power state of GCN 1.1, I imagine they could easily overclock the hell out of it so it surpasses the Ares II or Devil 13 HD 7990s.