This video tour by Peter Loforte, GM of the Tablet PC team is well worth the 10-minutes:

http://channel9.msdn.com/ShowPost.aspx?PostID=7603

I’ve found that these enhancements have made it much more possible to use a “slate” Tablet PC like the Motion M1400.  Before this I could only use a convertible like the Toshiba Portege 3500 because I felt like I “needed” the keyboard a lot more.