CNET offers some more info on the upcoming high end MacBook Pros which until now have had NVIDIA discret GPUs.
15- and 17-inch MacBook Pro/AMD graphics: AMD (formerly ATI) “discrete” graphics silicon is now offered in the larger, more powerful MBPs. As in previous MacBook Pros, the discrete graphics chip is only fired up when heavy lifting is needed. When power savings is paramount or high-end graphics processing is not necessary, the system defaults to Intel’s graphics.
CNET also mentioned that Apple would wait to release their new notebooks after Intel’s Thunderbolt announcement at 10am PT. Sure.