There's no way Canon is going to enter the medium format market. That would be incredibly stupid, for many reasons that I shouldn't have to go into here.
Can you explain it for us noobs?
Canon has pretty much, overall, dominated the DSLR market for a long time and is still very successful. There are already elite medium format makers out there, who have been dominating that market for years. Each have their own lenses, accessories, etc., that sell really well too. The medium format market is so much smaller than the DSLR market, there's no reason that Canon would try to compete there. Much better to stay in their own market. If they just enter MF, how are they going to compete with Leica and Hasselblad? It would hardly be worth even trying.