So straight from Dan Didio's mouth, he has apparently been asked a lot about which other Earth One titles will be popping up, Wonder Woman, Flash...and Aquaman. (And he basically said if Batman and Superman sell well, we'll be getting the others)
What this gets me thinking about is that Aquaman obviously exists as a "super-failure" in popular culture yet he seems firmly ingrained as one of the core Justice League characters, even if most comic fans could care not one bit about what happens to Aquaman after he appears in the Justice League.
What this gets me thinking about Earth One is how all the odds and ends of the DC Universe history will or won't fit in.
Personally, I don't want there to be a JSA or otherwise too much prehistory in the the Earth One universe. Heroes, especially the lesser appreciated ones, always tend to be better when there isn't a community of superheroes at their back. It raises the stakes.
So what would you all like in the extended EO universe? Carter Hall or Katar Hol? A Green Lantern other than Hal Jordan?