Something Something Piccalo day?
Nah, however I did find out Majin Buu is like a goddamned Snorlax. ***'s going to sleep for two months straight, so Goku turns to Frieza for help.
Buu hibernating for long periods of time was mentioned by Toriyama in the "Twel-Buu Mysteries" Q&A a couple years back, so this really doesn't surprise me.
There's no guarantee that Frieza will agree though; all we know for sure is that Goku tries to recruit him despite everyone else thinking it's an awful idea.
We're definitely getting someone from hell though, since the current anime tie-in arc for Super DB Heroes is about going to hell to recruit people for the tournament.
Also, the next Dragon Ball 4D movie will feature Super Saiyan Blue Goku facing off against "Broly God".