Im not so sure they are going to annouce a high end camera or a lower end they released the 750D and 760D plus the 5DS and 5DSr but nothing in 2015 in the enthusiast section the 7D MKII was twelve months ago so its time for the 6D MKII. The 6D was November 2012 and the 70D July 2013 but everyone is saying the 1D X or the 5D MKIII replacement.
If Sony are making inroads the A7 II and the A7S are in the price band that the Canon 6D sits in with the A7R MKII at the 5D MKIII price point. Likewise the Nikon D610 and the D750 are in the 6D sweet spot whereas the D810 is at the 5D MKIII price point.
I think they will save the 1D X replacement which could combine the 1D C to just before NAB in 2016. But hey who knows its definately got us all speculating.