During Raw, they aired commercials for many diff events of WWE coming to Canada(1 was a set of house shows on September 8-9, another was TV events on Canada, and another was a random set of house shows).
In one of them, they advertised Del Rio-Orton-Sheamus for world title, another it was Ziggler-Sheamus and someone else(I forgot who..), and another was Del Rio-Sheamus-Barrett.
Considering that Raw is in Montreal,SD is in Ottawa, and Barrett will be in Canada for the weekend right before those 2 events, I think he'll either have returned by then, or will be returning for those events.
I know he's been at other house shows recently, but this is in Canada. Don't think WWE would bring over superstars to Canada, if they're not gonna be competing on Raw,SD or even Superstars.