First up is The Legion of Super-Heroes in the 31st Century #1. This is the all-ages Johnny DC series spun off from the Kids WB animated series. This will be a 32-page book written by J Torres, with art by Chynna Clugston-Flores.
The other issue is Justice League of America #0. This is an issue you will want to get for free as it tels the story of Superman, Wonder Woman and Batman putting the League back together following the events of Infinite Crisis.
Free Comic Book Day will be held on May 5, 2007.