While I have been following the 'relatively' recent rumours and then announcements of the 1DX and 5DmkIII... it is the 7DmkII that I'm really most interested in.
The reason is that I have a 7D and I do not plan to move to a FF camera (at least, not at this stage). I enjoy photography as a serious and passionate hobby, and I take photos covering a wide variety of situations and genre.
I'm very happy with the 7D, though I do acknowledge actual image quality could be improved upon (noise at both low and higher ISO settings and dynamic range). There are also other improvements that could be implemented in a 7D replacement's handling and functionality too... However having written that, I find the 7D the most suitable camera for my needs and price range.
Personally, I don't think that the 7D successor (aka 7DmkII) will be an APS-H camera. Actually I think that the APS-H sensor won't be produced by Canon any more, for any camera. Particularly with the announcement and release of the 1DX, I think the current / new Canon focus will be on APS-C for budget / entry level and 'reach' - and FF for megapixels and professionals.
I have a core set of lenses that I'm very happy with (including the Canon EF-S 15-85mm USM IS and the Sigma 10-20mm EX - which are only suitable for Canon APS-C cameras). I also love the 70-300mm L on my 7D (giving me the 'equivalent' of a 112 - 480mm in 35mm format). The Canon 100mm USM macro rounds out this 'core lens set'.
So as a few people have already mentioned, I hope that the major improvement to the 7D will be better image quality (eg less noise at all ISOs). If they improve the AF and FPS, that will be a bonus. But I'm very content with the current 19 cross-type AF points and the 8 FPS. For example 2 weeks ago I took a series of bird in flight photos that I'm very happy with, and have received a lot of praise and appreciation from many people, including many serious photographers. See the photos attached to this post (note they have been downscaled for web).
Therefore I'm looking forward to what the future holds. I doubt that I'll 'jump' at the new 7DmkII when it's released, unless my current 7D is dead or 'on the way out' - and the 7DmkII street price upon release seems right. I expect I'll wait till I'll really need a replacement / new camera. Who knows, that might be when the 7DmkIII is being rumoured about... or even released. I used my Canon 350D from 2005 till I got my 7D in late 2009, and I use my 350D as a backup, and it still takes good photos (even with a high - over 80,000 shutter count!)