Yes, just an unconfirmed rumor, but who knows? While he has said that he wants to stay at Monday Night Football, there aren't many coaches his age that are ready to hang it up completely.

http://www.cbssports.com/nfl/blog/eye-on-football/21265650/report-jon-gruden-raiders-in-talks-about-a-return-to-coaching

I don't know if he would be the right coach to bring in, but the thought of it could make for some interesting conjecture...