I think Canon will keep the 1DIV along side a new 1DV body, then photogs will have a choice between FF & APS-H. I would imagine a FF 1DV will cost well above 5K and could easily be the next flagship body, high performance and FF are no longer mutually exclusive, Nikon has proven it and Canon will definitely need to match it. I still don't see the purpose of another 1Ds body, people spending that kind of coin could easily step up to the higher end brands and I just can't imagine that Canon sells THAT many 1Ds bodies, hence the long hiatus as they decide if it's really worth it.
By the looks of it, Canon has no intention of competing in the midrange fast FF market, leaving it to the Nikon DXXX bodies, I see the 5DIII continuing to push the video niche without fast fps or sports oriented af. It's working for them, so who could blame them.
if the 1DV, is FF and hits 10fps, it will be my next body. If by some miracle, the 5DIII can do at least 8 fps with decent af, then I might go for that. An APS-H 7D might be the sweet spot. I still could give a flip about video so no opinion there.
god I love speculation....