Non-story. Someone said this last night after the video package, that the internet would go crazy about Sting returning. Sting is a major part of TNA programming right now, he was included simply because he is a former World Champion, not because WWE wants him to sign. I don't think so anyway.
Plus, if Sting wants to join WWE once he leaves TNA, all he has to do is say the word and he'd be signed on the spot.