Is there ever going to be a season 3?

GenRex was renewed for S3 LAST summer and renewed for S5 this summer. So, yes, yes, and もっと見る yes. We have AT LEAST 3 and a half もっと見る seasons to look フォワード, 前進, 楽しみにして to, if MoA honors the CN contract and vice versa, but with B10, I doubt that'll be a problem.

EDIT: lol IGNORE THAT.

While MoA still wants to continue, Cartoon Network has cancelled the series.