A pretty good predictor of announcements has come about and said there will be no 5D replacement at PMA.
If you check his/her history, they're always bang on.
That doesn't rule out another FF camera body, there's always been a mumbling that the 5D would be split into 2 cameras.
I'd be resigned to the fact we'll be seeing a new Rebel and some compacts and perhaps some flash upgrades.