Crash.net (which is like The Sun of the racing world) is reporting the Eddie Jordan (who is also known for wild remarks) says the Schumacher to Mercedes GP deal is definitely going to happen.
http://www.crash.net/f1/news/154816/...to_happen.html
If any team was to make it happen, this would be it. A Ross Brawn led team owned by a German manufacturer is probably just about the only team that could pull him out of retirement (baring his Ferrari contracts and whatnot).