From that little blurb, it looks like they did basically nothing except convert everything to 3D. I wonder if that's really the case, or they're just so excited about the 3D stuff that they failed to mention the other improvements...
Hopefully they managed to fix some of the ton of bugs in 2006. I must say, 2006 seems a lot buggier than 2004, which I was using before. I hope that trend doesn't continue.