From Wikipedia: In February 2015, it was reported that a theatrical Adventure Time movie was being developed by Cartoon Network Studios, Frederator Films, and Warner Animation Group. The film is being executive produced and written by Pendleton Ward, and produced by Roy Lee and Chris McKay.[206] In October 2015, series producer Adam Muto confirmed that series creator Pendleton Ward was “working on the premise” for the film, but that there was “nothing official to announce yet.”[207]

Wow I'm so excited about it 😻😻

I also heard an Adventure Time movie was coming out by channel frederater