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 भेड़िया Games, where all the पिल्लें 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 द्वारा the moment.