When he returns you will see it and know about it when everyone else does.
Yes, Jericho chose WWE over TNA.
And the rumors-started by Dave Melzer of The Wrestling Observer I believe-about Jericho returning at the No Mercy PPV could be just a rumor!
It would be smart of WWE to announce the return of a former WWE Superstar at the PPV in order to get a higher buy rate.
And people already have it burnt into their brains that it's gonna be Chris Jericho, so, the buyrate will skyrocket.
However, knowing the WWE, they would have someone like Gillberg return to take part in a Cruiserweight invitational!
But, like I said, when he shows up, you'll know all about it, even if you don't See the event.