So?
They dont all run at the same speeds, and no one has tested the SB processors to be used in the next Air on OS X, so its impossible for anyone to say how well the HD3000 in the Airs will run in comparison to the 320M in the C2D model.
It's not hard to make some basic inferences. Clearly it's going to run between the current air and MBP.
I don't know why people like you live in a fake world where you think there's going to be some kind of magical GPU in the next model that runs everything fast.
Come back to reality.