According to the horror-obsessed fiends at Bloody Disgusting, there are whispers floating around non-substantially around the Walking Dead set that might mean a feature is on the horizon, potentially as a close-out to the series. As the article points out, there is nothing close to being official, not even the conversations about a movie.
It raises an interesting possibility though. It wouldn’t be the first television show to go to the big screen, although the recent track record for shows making the leap is not great (especially for fans of The Sopranos or 24). Hell, even with more episodes coming, the Arrested Development movie still isn’t exactly a done deal either. Frankly, transitioning from television to theaters is difficult both artistically and logistically. The writers would need to craft the best possible 2-hour episode of the show, and they’d have to get as many or all of the main cast to come along for the project.
There are a million steps to completing a film version, and it’s unknown whether AMC will even take the first one, but a movie could absolutely work. It wouldn’t be able to capture the long-form trajectory of the comic books, but since the show is doing that heavy lifting (when it cares to line up with the comic, that is), a movie could be free to take characters we’ve learned to love over many seasons and place them in the comforting familiarity of a zombie flick.