Board Thread:News and Announcements in game/@comment-27996636-20170423115143/@comment-26239911-20170423163836

It says above the banner: "Double DOKKAN festival which is divided into super system and polar system will be held soon !!"

Super means super types (obviously) and polar means extremr (for some reason) in Japanese. The banners will probably be divided into Super and Extreme types, like VB and Rosè. I'm 99% sure that Gogeta and Janemba will be the Hero/Extreme leads, unless Bandai just randomly wanted to do it like that.