Canon rumors is basically full of crap. They're almost never right. 99% of what you read there is pure conjecture from guys like us. Only occasionally does someone with real knowledge sneak in with some real info.
Hopefully they're very wrong about the 22mp. That's hardly going to provide any improvement in detail. They've got the 1D-X as their fast camera, so they need to make the 5DIII their high rez camera. Also, there'll be tons of enhancement to video capacity to regain the 5D's position as the go-to, inexpensive, high rez video solution.
Should we set up a pool? I'll take the August announcement/fall delivery position.
BTW, at 22mp on the 5D3 the 7D would still be the detail hi rez king in the Canon line, by a long shot.