I've heard nothing of a KP movie other than the hopes of other fans.
Disney is really funny about KP. First the pumped it up as a Disney Channel Original and it was a hit. Then they canceled it at the end of season 3 when it was still doing well. Then Disney brought it back after being petitioned by fans. During season 4 the schedule was never consistent and promos were non-existent after the first few weeks. The creators allegedly were fed up with Disney and decided to stop production after season 4.
BUT, you can still wait on a long line for a meet and greet with KP and Ron in DHS.
I think that there is still life left in the KP franchise for a movie, but considering the handling of the program up to this point I doubt Disney feels the same way.