Sooooo now that Caribou's Kehihihihi in the New World has (finally!) ended, there will probably be a new miniseries soon. That, or lots of animal pictures until the Dressrosa Arc concludes. Here are some possible ideas for the next miniseries. If you've got one, sound off in the comments.
Vergo: Since a Punk Hazard Arc character doesn't have a miniseries yet, I think Vergo is the most likely candidate. Sure, he was believed to have died, but no one except Ace and Whitebeard ever truly die in One Piece. Vergo was cut into pieces and exploded last we saw him, so it would make a good "start from the bottom story"
Bellamy: It's never been done, but it would be cool to have a "flashback" miniseries on Bellamy's adventures after Luffy KO'd him in Jaya.
Mocha and the Giant Children: This, I think, is the most likely miniseries to happen if Oda doesn't wait till the end of the Dressrosa Arc. Just how will the Marines and society in general interact with them? We'll see....
Aokiji:This I think would be the most awesome. miniseries. Just what has he been doing for the past two years? Where did he go after Punk Hazard? Plus, seeing an admiral in action in a miniseries would be sweet!