Yeah I think its unlikely that Fedor would go anywhere now that he has a 50% of every show that he appaers on deal with SF.
But I am sure that the idea of having heavyweight champion of UFC going up against Fedor is interesting for everybody involved, if not for anything else, for the money.
I dont think that those rumours have anything to do with reality though.
But who knows? We will just have to wait and see. In MMA anything is possible