32-bit rocks...it is incredible how much highlight detail is preserved when pushing the levels. Worth the upgrade alone. Even non-effected clips look richer...like After Effects! Can't wait to see what it does on composited clips.
Multi-cam: I do a lot of multi-cam and though the previous tools (Vasst,etc.) were great, they always seemed a bit wonky...no fault of the programmers, just the fault of what was scriptable. The new multi-cam is great...clicking on a take in the preview window to select it absolutely rocks. And there is no timeline slow-down when a new take is selected. Sweet.
Sure there will be bugs and sure, some of us will take a while to figure out some issues, but what an awesome move in the right directon. I'm buying this upgrade as soon as I get home!