One common theme is adventure. Since Gohan has his Beast form, they might go on adventures together fighting enemies. Another theme could be romance, exploring their relationship deeper.
Honestly, there's no fixed date for the return of the DBS manga. It depends on various factors like the creator's schedule and production plans. But you can follow related fan communities or news sites for the latest updates.
The DBS manga is canon. It's recognized by the creators and fans alike. It follows the established rules and continuity of the Dragon Ball Super world, contributing to the rich narrative of the franchise.