Canon is a big player and will try to stay one.
So: if Nikon, Sony will cycle/refresh their products, so Canon will follow.
The Mark 2 is still a very good camera I like to use, although spoiled by the Autofocus of the 1D Mk4.
Nobody is sleeping their, maybe the big three are playing Mikado (first who moves has lost), waiting what the others do.
New cameras in the class A900, D700 and 5D will come, it`s the money.
Pretty sure this year.