It's almost free
The price of the 40D continues to crash around the globe. It's almost free in the UK and US. This adds more fuel to the fire that Canon will be introducing 2 new FF cameras for Photokina.
I still don't expect the 40D to be outright replaced.
NL added the question whether or not either of the new FF cameras would be able to use EF-S lenses, I'm sure it's possible engineering wise. Please correct me if I'm wrong.