He wont return.
He is a very successful actor now, he has no reason to return, he came to wrestling, he saw wrestling and he conquered wrestling.
plus, did anyone notice he seems to be trying to drop the name "The Rock"?
In his past movies he has been called "The Rock" for his credits, but in the very newest one (That football one, cant remember the name) he went as Dwayne "The Rock" Johnson.
But then again, maybe its just like Jesse Ventura.. who knows, all i know is Rock will never return FULL TIME as a wrestler, it would be nice to see him come back and do a match with HBK or something, but thats all he might do, a one-three match return probably