Green Lantern! Awesome! Something drawing heavily from Geoff Johns' stuff would be great... And I wouldn't mind Public Enemies, either.
As for a wish list, I agree--Long Halloween would kick ass. In a perfect world, I'd love to see something Legion-oriented, too... The Great Darkness Saga tops the list, and I think that Johns' Superman and the Legion Of Super-Heroes arc would be pretty good fodder for a feature-length animated project, as well.
I'd also love to see something Flash-oriented, especially if they could get Michael Rosenbaum back as Wally West. Maybe Mark Waid's Return Of Barry Allen arc? You could even get Neil Patrick Harris to reprise 'Barry'. I think it could work as a self-contained piece. Just add a little prologue depicting a nice Silver-Agey Flash/Kid Flash tale, something akin to the old Filmation Flash segments, to set the scene and establish the relationship... then flash forward (heh) to Wally having stepped into Barry's boots. A voice-over narration in the classic 'My name is Wally West and I'm the fastest man alive' vein (and I tell you, I was so disappointed that we never got Rosenbaum doing that type of narration in Justice League/JLU, so I'd love to hear him say that line for once) could finish up the necessary exposition by explaining that Barry died heroically and Wally took the Flash mantle in honor of Barry's sacrifice... maybe allude to Wally's rough settling-in period and his fear of 'replacing' Barry... and go from there.
