This sounds very interesting! 10mp and finally a dust cleaner. I was waiting for a Nikon with a dust cleaner but unfortunately the D80 does not have it. My next SLR might well be this E0S 400 if its review is good :D
What's also nice is it can finally have up to 9999 images per folder on storage card. On the 350D it was only up to 99 photos per folder and it was so annoying to end with many folders to download instead of a big one like on the Nikon D70. The 2.5'' LCD is nice too :)

http://www.dpreview.com/news/0608/06082416canoneos400drebelxti.asp