From this article on, it looks like Internet Explorer 6 might be coming with the Whistler betas or soon thereafter, and it's supposed to contain elements of the new MSN Explorer [Ed note, see article on MSN Explorer earlier this week], along with media and IM bundled (built in?).

What remains to be seen is if they'll fully support W3C or CSS1/2, and whether they'll finally add SVG support.

My bets are that they finally will support XSL 100% with the 'gold' release of the MSXML parser, which was released October 31st.