Regarding compatibility of the Game Blaster card, which only works with ASRock boards, check the list here:
ASRock > Products > Game Blaster
Wait for socket 1150/Haswell CPUs? No difference in the PCI-e lanes between it and SB or IB CPU boards, but IB and Haswell CPUs support PCI-e 3.0 speed. Support for Game Blaster on ASRock Haswell boards remains to be seen.
X79 boards will provide 2 x PCI-e x 16 lanes, that is not available on the other Intel platforms. But, PCI-e 3.0 support is really not available on X79. Will IBe CPUs bring PCI-e 3.0 support? They should, but we'll see how well current X79 boards work with IBe CPUs.
This cards price? I can't find them sold separately, or a way to buy them through ASRock.