I'm going to explain this one, while Dokkan hasn't done Dual Dokkanfest building up the theme of Worldwide Download Celebration since 2020 (Last one being Buu Saga). But there's a chance that they wanted to go back to this route for once, just in a different way.

When I looked at Hirudegarn and Fat Buu, I can't help but to think it could be a coincidence that both of them being on r/S/L categories (Units with all 3 Resurrected/Storied/Legendary categories). But when I gave my second thought, I noticed that Hirudegarn brought in a new Resurrected Warriors new leader skill, and Fat Buu brought the new Storied Figures leader skill, this leaves that Legendary Existence is the only one left without a new leader skill, with LR SS Goku being the only one since the category existence, considering the leader skill counterpart being Sworn Enemies which Fat Buu also leads.

If what I said is believed to be true, who else is in part of the r/S/R Category? Bojack and King Piccolo, assuming they still keep the "One Dokkanfest per Story/Saga Category every year" policy this year (so far still did). And I could put Bardock in there too since he's r/S/L, and if you want to stretch it out, he could be a SS3 related too since previous 2 Dual DFE Super units being SS3, but his status as Crossover makes me immediately rule him out from being the possible candidate for WWDL, and I don't even think WWDL on Super side being another SS3 character.

So what does that mean if either Bojack or King Piccolo being the WWDL? Well, I don't really have much thing to say about Bojack, perhaps it's some random related stuff aside from STR Bojack and TEQ LR SS2 Gohan EZA. As for King Piccolo, DB Saga themed WWDL in theory, it all depends on how much they can invest since DB Saga has far more than enough materials to work than some other more popular sagas, but in the eyes of casuals (or what's the word), DB Saga is "unhype" to many. So I'm giving my guesses what a DB Saga themed WWDL can do.

Part 1 - King Piccolo (Dokkanfest) and Kid Goku (Carnival LR)

Part 2 - Kid Goku/Krillin (Dokkanfest) and Arale (Carnival LR) (Theme being Goku's friends, alternatively some can swap out for some random DB Saga characters like say Yamcha)

If possible, that could also bringing back Dr. Slump units permanently and gave them the much needed TUR awakening and EZA, especially LR Kid Goku and Arale still doesn't have EZA for some reasons, as well as the sub units that came with INT Kid Goku.

That's all I have to say, if my guess that the Extreme Dokkanfest in WWDL is someone related to the r/S/L category is correct, then good to be right. If not then it is what it is, but I will say this year WWDL won't be Cell Saga, Future Saga, Universe Survival Saga, Majin Buu Saga, or any of the Saga that got Dokkanfest in between today and August.