All right, I know this is somewhat late. However, as you might have gathered, my focus of work this year will be fleshing out the Justice Alliance and its Earth-500. 
What I envisage is
-further Young Defenders cases
-elaborating the darker version of Project Cadmus that exists here (and why Earth-500's James Olsen is on the wrong side of the tracks)
-Superman and Superwoman have a pleasant surprise coming
-a look at Earth-500's Atlantis Colony, Aquaman and homo aquaticus in more detail
-Universe-500's Green Lantern Hegemony and Jose Hernandez' comrades in his occupation
-Thanagar-500 and why Kator and Shay Hol are refugees on Earth
-Tanaka (Flash) Rei's rogues gallery (and how it differs from Barry Allens)
-why Earth-500's Wonder Woman has never remarried after her Steve Trevor's death

All in all, Earth-500 is a lot like Earth-One in some ways, although not in others. Superman and Superwoman are married, Kator and Shay Hol are siblings, Helena Wayne is Robin while its Dick Grayson has gone off to Hudson University (but won't become Nightwing on this Earth), Batman and Catwoman are married, adopted Dick and as well as Helena, have several children. The Atom and Green Lantern are both gay and in relationships (and the Atom is married to his Earth's Chronos!), Aquaman is from a divergent species of humanity and Atlantis is  a recent seabed colonial settlement, Green Arrow is a Native American, J'Onn J'Onnz escaped from Mars with his wife M'yrrha, and Wonder Woman has a daughter, Unitta. 

I intend to reinterpret some old Earth-One stories, but their outcomes will diverge from those that originally occurred.