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That's the only acceptable design for their FF DSLR.
They have IBIS technology too, and I doubt they'll use the A7rII but the A7r would do the Job just as good, if they do a similar job as Nikon with D810.
The only issue with their IBIS implementation is that you won't have the viewfinder stabilized, only in Live View.
And they are known for underpricing for the specs, so I can see them being pretty competitive against a 6D and D750.