According to a PFT story tonight, not only is Manning planning on returning this season, but he's also stated that he's coming back for 2016---even if that's for another team.
Like I've said many times, there's no way that a diva/attention whore like Manning is going to go out with a fizzle. If he's retiring, we'll all hear about it plenty of times for his farewell tour.
While it's tempting to want to start dancing on his grave at the moment, I'm going to hold off until I'm sure the forehead is 100 percent gone.