I've heard rumors floating around that there will be a POM movie coming out in 2015, but I can't find an actual thing on the Internet saying its true. Is there really going to be a movie? If so, what's the plot, and when's it coming out?

It's scheduled to be released on March 27, 2013 in the U.S. Here are a couple of links you can go to:

link -- Not the most reliable site, but I usually keep an eye on it. It really only has a release date and a rumored cast list.

link -- This one has a little more information. :)

link -- Tells about a couple of voice actors that will be joining. :D (Thanks to link for that link.)

Hope that helps. :D

it's true. they even mentioned some of the voice actors that'll be involved in the movie