There have been multiple Rebels launched since the 60D, so 70D is next in line, especially as Canon is now more interested in volume-selling. The 7D mark II can wait until 2013, when the 7D will be 4-years old.
Enthusiasts/Pro's have had 2 new flagship products already in 2012 - the 1DX and the 5DIII, they're unlikely to get any more
The marketing people (who really run Canon) will want to leave the 5D2 as the 'budget' FF camera. Why would they shoot themselves in the foot and introduce a $2000 FF body -> that would both hurt 5D3 sales and ruin any chance of a similarly priced APS-C body (aka 7D2, which will likely cost $2500 or 7D1 + $1000)
Finally, as the T4i/650D shows, Canon do not have a new crop sensor yet. So there is no point in a 7D2 without a new sensor with better ISO performance and DR. Therefore the only possible choice (if any at all) will be an 18MP 70D with similar AF to current 7D, 'tilty-swivelly' screen, semi-plastic/semi-metal body, with all of the latest features & functionality that firmware 2.0 for the existing 7D recently brought...and oh yeah... compatibility with STM lenses and continuous AF during video recording. It might even be able to trigger the new 600EX-RT flashes too.
Simple logic combined with an equally simple process of elimination suggest that a 70D @ $999 price point is the most likely new camera body announcement at Photokina by Canon.
Poll