I won't believe it until I actually see his name playing the match, too many ups and downs with regard to his comeback.
I really hope he's cured his service problems, but I somehow doubt it.
Even if he has, he could struggle. He has a beautiful game, but I fear the game has kind of passed him by. It's tough for guys like him, Nalbandian, Hewitt etc. who have a lot of talent but aren't able to blitz winners (especially off the serve).
If he is indeed coming back I have no doubts in my mind he'll make it back to the top echelon
A player like Canas has been able to make a successful comeback and these two are worlds apart in terms of talent.
Players of true class have always been able to move on and adjust their games (Agassi comes to mind), and he has a great tennis brain - something few in the game have nowadays.