Given Jobs' medical history and the high profile of AAPL, I'm really, really surprised that the company has not telegraphed a management succession plan.
I predict that Jobs won't come back to work but he will continue to offer advice and perhaps aide in negotiations with operators, media companies and the like. Then, after about a year or so, people having realized that the company does fine without Jobs, it'd be safe for Jobs to relinquish his position as CEO to Tim Cook. Jobs can then simply stay on as advisor.