New Expression build will be available "soon".  I've been working on the Feb CTP bits for awhile, and its a great build...faster, fewer bugs,  much closer to the final deliverables. 

http://www.microsoft.com/downloads/details.aspx?FamilyId=F51C4D96-9AEA-474F-86D3-172BFA3B828B&displaylang=en