Why would they bring out a 650D, when the 60D is less than 18months old and still selling well?
The new 7D will come out before the new 60D, as the new 60D will inherit the new 7D's sensor etc, and the 7d is older.
The 600D is even newer than the 60D, so apart from the 7D (and the new 5D MkIII), I think Canon would only bring out a new DSLR into a new category and not to replace any current models for the time being at least.
I could understand that Canon would bring out a mirrorless camera, using the new sensor from the GX1 and the ability to use EF-S lenses, as this would be a great idea for Canon and would give them an instant large range of lenses for the new mirrorless camera, but I doubt they will bring this out for another year or so, so that the GX1 can get some runs on the board first.
Maybe they will bring out the mythical 4000K video camera?