I figured out how we are getting Carnival Gogeta in Part 2. Themes will SWITCH in part 2.
Maybe this will get lost in meme weekend lol But this is my theory. The theme will switch in part two where there will be 1 new Dokkan Fest unit for Family and Rivals from Super with a banner unit, and two new Carnival LRs for Miraculous Power Born from the Strongest Duo. Those being (Super) Gogeta and Father-Son Kamehameha.
I don't have a working theory as for the units from Super. Could be anything. But I can't see how they could have an anniversary as big as this with a Vegito and no Gogeta.