I saw GOTHAM KNIGHTS as just an additional way to cash in on THE DARK KNIGHT.
And indeed, George Newburn has voiced Superman in JUSTICE LEAGUE, JLU, and for his appearances in STATIC SHOCK and THE BATMAN in the last season. Tim Daly reprised the role for SUPERMAN: BRAINIAC ATTACKS, which was so terrible even I couldn't sit through it on TV. And I've sat through SPIDER-MAN UNLIMITED for heaven's sake.
While I am likely going to get GREEN LANTERN: FIRST FLIGHT (I skipped WONDER WOMAN, since I was never a fan of hers), I am interested in SUPERMAN/BATMAN: PUBLIC ENEMIES. Part of me wonders if this special may suffer from some of the same dilemmas that SUPERMAN: DOOMSDAY did. Not so much as not being faithful to the comic series which which it was loosely based on, but because Bruce Timm has essentially covered a similar storyline via his 14 years on TV with DCUA. I mean, episodes of S:TAS and JLU covered much of what was in SUPERMAN: DOOMSDAY and Timm ended up repeating some of his Bizarro episode stuff in that without realizing it (according to the commentary). Well, in JLU, Timm & Co. did approach a "President Luthor" type storyline. Luthor was running for office, busy framing the JLU for stuff and making Superman lose it in public to ruin his image a little, was basically funding metahuman response methods against them, and so on. SUPERMAN/BATMAN: PUBLIC ENEMIES does have the risk of going over some of that ground if the story is not careful. The animation style is closer to the SUPERMAN/BATMAN comic storyline, though, and in that story Luthor actually successfully does become President (albeit is impeached after trying to kill the duo with his wonky green armor).
Still, I am interested.