Yeah, that card is way too big... It's like almost the size of the mobo. I mean seriously. Not practical IMO.
Don't get me wrong, the processing power and potential is mind blowing, better then SLI. But, the application of a HUGE board installed into a motherboard almost exactly the same size is plain silly.
Something that size needs it's own case... Seriously. With PCI Express i'm sure they can figure out a way to make that sucker an external device with the same bandwidth and speed as an internal device. Think of all the case mods and cooling systems you could incorporate into that thing. GEEZ it could have it's own Power Supply. I don't know... Creativity is a wonderful thing....