Yeah, less noise than the 5D Mark III is definitely wishful thinking. The 6D appears to be improving significantly on the 5D, and it's notable in some situations, but for a better idea what a 7D to a Mark II improvement would look like, it'd probably be better to compare 5D Mark II images with the 5D III. More time has lapsed since the 6D release but if the 7D releases in early quarters of next year it should be a roughly similar timeframe.
What I'm curious to know is whether there will be another APS-H system. I'm not especially well set-up for one, lens-wise, but I would be able to get used to it, I'm sure. If the sensor exceeded the 7D's resolution (or at least met it) taking into account sensor size differences, it'd be a worthwhile all-around upgrade, with the benefit of more light capturing ability and wider perspectives when needed, and by a fair margin.
APS-H reintroduction would also account for a new series name.