During an interview with Scott Fishman during his press tour for his latest movie Check Point, which you can read in full here (plenty of interesting stuff there), Goldberg was asked if he'd been contacted by WWE, to which he replied:

“When something supersedes your business sense, it has to be ego or something ridiculous. I surely am not going to miss a bit of sleep if I don’t get a phone call from them. I just got contacted by TNA a couple of days ago. I don’t know. They want to promote the movie since one of my adversaries in the film is Bram (Thomas Latimer), who works for them. I’m greatly appreciative they want to help the movie out. Now at the end of the day, promoting the movie is one thing, but getting a guy like Goldberg in your wrestling organization is a completely different story. We’ll see.”

Well, he definitely didn't say no the possibility of going to TNA, though it seems like TNA might need to break the bank to get him. Could be interesting...