I just wanted you to know that we got your questions and are working to get some answers to you. Its a bit outside our normal scope of MSDK support, so we have to track down the people that have this info.
MVC decoding is supported in software in the Media SDK Beta. Its available for download right now at:
Getting the video driver to accept frame packed 3D output via HDMI 1.4 is another matter. For this issue weve been discussing it internally quite a lot. The good news is that I am confident that there will be a way for developers like yourself to set the driver into that mode. The open question is when and how. Theres a few efforts underway to have a solution available in the short term. Ill continue to update you as those efforts progress.
Hardware based MVC decoding will be available using the Intel Media SDK 3.0 on Intels next generation platform. The beta is being made available now to get a jump start on next years media products.
Using native DXVA with multiple decoders to achieve MVC playback on Sandy Bridge will work, but the effort from a development perspective is quite large. MSDK 3.0 provides a much easier path.