There's a good impression of what a 7990 or 7970 X2 could look like. 4Gamer published some nice shots of the FirePro W9000 dual-GPU card that was briefly shown at AMD's Fusion Developer Summit you can... More...
According to muropaketti.com and techreport.com that card was not W9000 but something else. W9000: and this is? From techreport: "On my way to the airport this afternoon, I asked AMD's Dave Erskine for clarification. He told me the card Papermaster held up was actually a "dual-GPU product that will be released later this year." That's all Erskine said." http://techreport.com/discussions.x/23114 http://muropaketti.com/amd-paljasti-kahden-grafiikkapiirin-radeon-hd-7990-naytonohjaimen
There is some confusion here. The card pictured in the first slide is labeled as W9000 but it has 4 Dislpayports (and single fan): FirePro W9000: Tahiti GPU operating at 1GHz Southern Islands GPU Architecutre 4TFLOPS Single Precision IEEE 754-2011 1TFLOPS Double Precision IEEE 754-2011 384-bit Memory Interface 6GB GDDR5 Memory 6 DisplayPorts 3x 92mm Fan (design resembles Arctic Cooling)