Will it be a McDuffie repeat? Itdoesn't look like he his diversifying the team, but it looks like he'll be telling the story from a different angle. The synopsis feels like an "Identity Crisis" style story.
I'm thinking Priest has gone on record saying that his favorite GL is Hal Jordan (and of course he wrote a GL prose novel involving Hal, as well as the Emerald Dawn arc many years ago).. But if John Stewart gets involved I'm sure Priest will treat him with respect. Priest was off-grid when Simon Baz and the new female Lantern got created, so I'm interested to see what he does with them. Especially with all the "overlap" that multiple Earth-galaxy Green Lanterns represent, I'm curious if he'll try to deconstruct what that means in terms of looking at the raw power that they represent.
I'd love to see Superman, Batman, Wonder Woman, John Stewart, Cyborg, Hawkgirl, Vixen and Mr. Terrific in the mix, for sure.