JSA Rebels- Huntress leads a squad with former criminals or their kids. Based of the recent JSA first issue.
Tim Drake is a white hat hacker who emulates Batman in the White Knight verse.
For the new 52- I would've taken a page out of Mark Waid's Legion reboot and given the legacy characters new ids, histories and maybe powers. The relationship with their mentors would be kept but everything else overhauled.
2011's Legion Lost gets adapted for Superman and Lois. Timber Wolf, Wildfire and Dawn Star knew Clark. They met after he met Jor-el.
JL 3000 would be about a few legionaires who take on the JL mantles ie Karate Kid is Batman.
Renee Montaya, Anarky and Traci 13 team up to stop a mystical crisis in Hub City.