JonJT, whether or not Canon puts an APS-H sensor in the 7D is unknown (likely or not) and I don't believe they are concerned about your investments in EF-S lenses. They might look at it as more lens sales. IF (and a big one) they do go the APS-H route, maybe they'd be nice enough to make it an APS-C mount on it like Nikon has for their FF. I don't see why they couldn't. I don't agree with the FOV argument either. Most people move up to the zD line because they are progressing and need/want better equipment. Adapting to new equipment is just part of progress.
What ever they choose to do with the 7D, I just think there needs to be more separation between the zzD line and the 7D. IMHO, there just isn't enough at the moment. According to Canon's release timeline, they are also due to put out the 70D and if you were to make the 60D any better, it would be as good if not better than the current 7D. I'm tired. Am I making any sense?
I understand they can't make it too good or it may hurt sales in the rest of the lineup, but I think making it sort of a mini 1Dx with an APS-? sensor would be the best move. Improve the image processor, ISO performance to at least 12,800 before expansion, maybe 10fps RAW, improved battery grip with more function (still a separate purchase), more cross-type AF points, etc. Sort of a 1Dx Lite.
As I said before, the mkII is likely going to be my replacement and I just hope it's not just a lazy attempt to sell more cameras. I'd like it to stand out and shine against it's competitors and the zzD line. It would be nice to have the APS-H with EF-S capability though.