I mean I expected it too since it very clearly replaces the Egi in the job actions trailer.Chatter has it as tomorrow morning; there's some weird the end date of the embargo may,itself, be embargo'd thing going on, but leaks spring up here and there and tomorrow seems to be a common theme.
Also if the SMN 'leak' post on Reddit is true I expect SMN to get massive hype pretty quickly. Bahamut has a petbar!
I'm going to wager it upgrades Ruin III when in whatever that state is, or makes a new ability available during it. The question I'm interested is if you can manage to keep Bahamut out for an extended period of time or if there's no way to refresh the 20 seconds it spawns for.
Our own Damiani has said stuff is going up tomorrow btw. https://twitter.com/mbdamiani/status/869673743701782528