Is the New 52 Alan different from the original one, at least in personality, powerset and ring origins? All I know about the former is that he's actually from Earth-2, he was gay, and possibly was killed.
The answer to any question about New 52 Earth-2 is ¯\_(ツ)_/¯
Pretty much. Earth 2 used to be my favorite N52 book until uh, about two years into it when they decided to just light everything on fire.
So N52 Earth 2:
Alan Scott is like a gay Tony Stark, who should have died in a train accident but was protected by the ring that chose him. The Green (same Green that powers Swamp Thing) decided that it needed to protect Earth and made Scott their hero. Which was very important when in Earth 2, the Old Gods, Superman, Batman, and Wonder Woman have all died leaving the planet defenseless. So he was very much positioned to be the central figure of this new not!JSA book. But his lover died in that accident though because the ring only protected Scott, so he's full of RAGE! And thus because he's so angry and is new at this, he isn't super great at doing his job. At some point I'm pretty sure he fuckin' died, but got resurrected because The Green still needed the planet to be defended and he's basically Earth 2's Swamp Thing, not a Green Lantern. But! Then Darkseid launched Apokolips at Earth 2, and it ate Earth 2, and Earth 2 died. And with it, Scott lost his power because it was fueled by The Green and thus The Earth and thus no more more Earth 2 means no more power. But eventually a small group of survivors (think Asgard refugees on the space ship) crashes on a new planet and that's the new Earth 2, found because Scott used the last of his powers to find it. And at some point, Scott links up with The Green on this new Earth, so he's back to being Green Lantern, but he's still really sad and detached from humanity b/c his lover died and Earth died and all the other heroes are assholes, etc. So he just keeps to himself while Power Girl fights Valzod for some stupid fuckin' reason and that's about where I gave up on Earth 2.
I'm probably wrong about a few details because it's been a while, but that's the general gist of it. If they wanna keep Alan Scott gay, awesome, I really don't care. But I hope N52 Earth 2 gets memory hole'd hard and nothing else about it makes its way into this new show, because holy shit what a garbage fire.