I heard that the reaosn there are only 13 episodes this year is because they're also working on a movie. Is that true? [video=youtube;Gkvc_gyVgCg]http://www.youtube.com/watch?v=Gkvc_gyVgCg&list=UUvzWGXYFDiiJ338KIJPhbhQ&index=13&feature=plcp[/video]
It's plausible. However, seasons are also released in 13-episode incriments. As you have seen with the first two seasons, they are 26 episodes long. The current 13 episodes are the only confirmed, but I'm sure there will be more in the future. Then again, I could be wrong and there could be a movie.
What you have heard, is indeed, a rumour. Where I, and everyone else who's spread the information about the 13 episodes has heard it from, is a podcast with the new project leader of MLP who replaced Lauren Faust after episode 2 of Season 2. In the podcast, she confirmed that there would only be 13 episodes, but she also confirmed that there was definitely not a movie in the works at this point. However, she said that there is a lot of development going into the time they've created, so hopefully the upcoming series will be stunning to say the least. tl;dr - No movie yet, sorry to be the buzzkill