What do you think the 3 other Protoframes are gonna be?

My personal thoughts for the 3 remaining frames are Ash, Ember, and Frost. I don’t think it’ll be Rhino since they’re already doing his heirloom, Ash makes sense because he’s supposed to get a light rework and the exalted rework. And then Ember and Frost as an “elemental duo” would just be a really fun concept. Feel free to weigh in and agree/disagree, I’d love to hear other ideas.