The thing about Rock is that he was in every game except for SoulCalibur V before now, and it's still a bit wild that he didn't make SoulCalibur V, because even Aeon did, albeit having stolen Kratos's moveset. Rock could have stolen Vader's or something, I dunno, if they were so intent on doing that. Hwang even stole Devil Jin's style in Quick Battle. So I don't get the "he's unpopular" angle so much, since even the popular folks didn't make it into SoulCalibur V, so that doesn't necessarily say much by itself. Though that being said, if Hwang and Li Long had made it into SoulCalibur IV like Amy, then Hwang could have claimed the same thing, and yes I'm counting Berserker/Assassin/Lizardman as Rock/Hwang/Aeon, even if that's not technically accurate. But if they did make the decision to cut out the "unpopular" characters Hwang and Li Long, then Rock should have been cut for SoulCalibur IV too, but he was not.
I still feel pretty strongly about Aeon and Rock being saved for season three. Hwang being in season two lets Yun-seong be in season three and yet not having both Korean swordies in the same pass, which some may gripe about. Hwang already has a teaser for his story in Seong Mi-na's story, as well as Libra of Soul, while Aeon also has this in Astaroth's story and Libra of Soul as well. Rock has just a mention in Astaroth's bio, but Aeon's story could/should involve his kidnapping of Bangoo, which would then give Rock an in, so Aeon would come first, then Rock would come after getting his hook.
Has it been confirmed that Rock is/was Berserker?