Although there have been several interviews with Canon staff discussing the recently announced EOS-1D X on the internet, I must admit I haven't read them in any detail as I know from my own experience that they're not allowed to speak candidly. However, this is often in stark contrast to organized PR events in Japan where they can be remarkably open, as is this particular interview with DC Watch.
Topics discussed include a possible studio or medim format replacement - Canon could make larger sensors and it wouldn't be a stretch to produce new lenses either (at least in theory, whether they have the manufacturing capacity is another matter). Please note it is in Japanese and, while Google does a fair job of translating, it can be a difficult to decipher.
Source and picture credit, DC Watch.
Canon unwraps EOS-1D X (with editorial comment)