First there's the low budget documentary focused on Micah True coming out any day now / within the next couple of months:
http://www.runfreemovie.com/film/distribution/
Second, there's Matthew McConaughey's movie which will be out in about a year:
http://www.theguardian.com/film/2015/jan/29/matthew-mcconaughey-native-american-born-to-run-gold