The PDF shows GPU Acceleration is supported for AMD's Radeon HD 6750M video on the MacBook Pros with OSX 10.7.x.
1) Does anyone know if AMD video card support is planned also for Windows systems?
2) Is "GPU Acceleration" for the Mac the same as MPE as we know it for the PC?
3) Has anyone tried this so far, and if so how well did it work?
1 - if "anyone" knows Adobe's future plans, they are not allowed to say until Adobe is ready for the announcement
Unfortunately, the Windows version of CS6 currently does not support OpenCL GPU acceleration at all. Thus, all AMD GPUs are locked into MPE software-only mode. Adobe has been working on adding OpenCL support but no date has been announced for its addition.