I understand that Premiere Pro CC upports OpenCL and is "unlocked"--does not insist on particular nVidia card.
That's a step forward.
Does Premiere Pro CC also support Intel Sandy Bridge GPU acceleration?
No. Premiere CC will continue to not support Intel's QuickSync for the foreseeable future. If you use only the IGP in Sandy Bridge and Ivy Bridge CPUs, Premiere CC will be locked to the MPE software-only mode (at least on initial release).