What bothers me about this rumor though is that I don't believe this: "...a new EOS-1 body."
New 1D could be high MP body
That would be my Guess as well, also my hope.
But why Canon would produce a high MP Camera in a 1 D Body, and develop a separate focus system to the existing 61 point in the 5DMK III & 1Dx ?? beats me.
I could see a 39 (pick a number) point system going into the 7D2, along with a better sensor (70D ?? Type), some better weather sealing, GPS etc, but you can't get away from the $$$, if the 7D2 is a 2k Camera Body, your going to get 2k value, those hoping for a 1Dx in a non 1 series body may be disappointed, again.
But if it had better IQ than the 1DMK IV, then it does become an interesting Body as a back up for the 1Dx in wildlife, the 1.6 sensor with real IQ would be interesting.