For some reason, I suspect phase 2 might bring back the Super Raid Bosses.
1) It's a Raid Boss event in the first place
2) We already have 2 types of bosses during this phase, making it seem logical that there's some "progressive reward" planned
3) We haven't had SRBs for a long while
4) Some Nutaku developers might've been reading our stuff, including our recent mentioning of super bosses, and figured it'd be a nice time to bring them back