What is Alpha and Omega 3's main plotline? I do not know if this information is out yet.

it's bout Runt, Stinky and Claudette (the 3 little sweethearts) getting booked in The mbwa mwitu Games, where all the mtoto wa mbwa from different packs come together and compete. also, King's coming back for revenge and he's probably going coo-coo (that's wat i heard)
and Princess might come back too, and she's probably trying 2 become a part of Kate and Humphrey's pack, even though the others don't believe her

There's gonna be a great event, a contest between the pups of two different packs and ... That's all info we have kwa the moment.