I heard that the venue for BUILD is just a decoy - the actual event is taking place elsewhere (sorry I can't tell you any more - I'm sure you understand.)

I also heard that MJF is putting a crack team together to blog the event (keep it to yourself)

http://www.zdnet.com/build-windows?tag=header;header-sec

Crikey, maybe the cat is out of the bag:

http://blogs.msdn.com/b/mssmallbiz/archive/2011/09/12/how-and-where-you-can-watch-the-build-windows-event-keynote-and-be-part-of-the-excitement.aspx