Want to look at what is under the wheel for internet explorer 9? You can download a test drive at this address http://ie.microsoft.com/testdrive/.
For now it is confirmed that IE9 will support addEventListener (lol) and border-radius, it score 55 on the Acid3 test. It was also said that IE9 will be GPU powered, from what I can gather, this is only true with SVG.
Canvas seems to be out of the question, every drawing demo are done with SVG.
Update: the complete change list http://ie.microsoft.com/testdrive/info/releasenotes/