I have A G27, and I don't intend to buy any other wheel. If it won't be supported by GT7, then I won't buy GT7 it's as simple as that. I said the same thing before Driveclub's release, and did I buy it? No. Hell I didn't even buy a PS4 yet. I'd for GT7, but not if I can't use the G27 with it.
If Logitech expects me to buy a new wheel for the ps4 for 400 then they're delusional. Even if I'd buy a new wheel it won't be a logitech one, because they betrayed every G27 and Driving Force owner (Oh yes I have a Driving Force GT too)