User blog comment:CoinsCP/Could Mixels have been renwed for a third season?/@comment-4835804-20150722002513/@comment-3263817-20150722003136

Not proof enough. Steven/Uncle Grandpa crossover, Transformers: RiD, We Bare Bears, Regular Show: The Movie, all in 2015, and while it also includes stuff for 2016, that doesn't confirm anything just yet.