The G31 was announced by Intel to also be available Q3 2007 and I just bought a G31 Mobo. The G31 chipsets were delivered to OEMs in July.
So logically the G35 Chipset Mobos should be around now if not really soon.
These new Intel Chipsets are really great. What a turnaround by Intel. C2D, C2Q and Great G3x chipsets.
Sucks to be AMD right now