The IE Blog have posted a Few details on the up coming release
They mention support for alpha channels in PNG along with better support for CSS.
The comments are quite good (until it posted on Slashdot - then the trolls start the anti MS bashing)
One comment which i though good was
"SVG support. Now that Adobe owns Flash, they may not be pushing SVG as its competitior, so MS could fill the void." - I figured if the buyout goes through then maybe Adobe would look at getting SVG into Flash not just do away with it??