It seems that (thus far) masters.com is providing us with two streams, both encoded using WMV3, the main profile of VC-1. Both are streaming 1280x720 video at 30fps. The 34369 stream (no longer posted on the masters website but still streaming if you alter the url) is the 4mbps stream (I'm averaging about 3900kbps), and the 42423 stream is the 2mbps one (I'm averaging 2100kbps). I had read somewhere that they were planning on hosting an H.264 stream as well, but I haven't seen it.
And I'm with Gae, hoping they make available for download some highlights at a higher resolution with fewer artifacts. Their primary (2D) streams look beautiful, and I would love to see that detail in the 3D videos.