According to Robert Sanchez of IESB and EW, there is some more information about the new JLA movie currently being formulated. Here's what he writes:

"The people over EW have printed, in part, the following,
EW - What we have seen remains faithful to the comic book that first appeared in 1960.

All seven original members of the Justice League -- Batman, Superman, Wonder Woman, the Flash, Green Lantern, Aquaman, and the Martian
Manhunter -- are featured in an origins story about the superhero conglomerate.

The plot revolves around villainous businessman Maxwell Lord and involves
cyborgs called OMACs (One-Man Army Corps), who can take over humans and turn them into killing machines. There are epic battles between Superman and Batman, as well as Superman and Wonder Woman.

Superman - A.k.a. Clark Kent, new reporter. The morally upstanding Man of
Steel battles Batman and has more to worry about than kryptonite.

Wonder Woman - A.k.a. Diana of Amazonian princess. Revered by the other supers for her beauty and ass-kicking abilities.

The Martian Manhunter - A.k.a. J'onn J'onzz, detective. His power to read
minds comes in handy as the villain engages in some nifty mind control.

Green Lantern - A.k.a. John Stewart, architect. Designed the Hall of Justice. His
emerald power ring shoots beams of energy.Batman - A.k.a. Bruce Wayne. The most human in the bunch is mistrustful of others, which leads to quite a few problems for the clan.

Flash - A.k.a. Barry Allen, cop. The most enthusiastic superhero, Flash is happy just to be included, but his ravenous appetite leads to trouble.

Aquaman - A.k.a. Arthur, the Atlantean King. Not a fan of humans, Aquaman is more interested in helping his fellow heroes than lending a hand to land dwellers.

EW is on newsstands now."

So what does this new info mean? Well, I'm not sure because the real news, the actors that the producers of the movie have in mind to play these characters, have not been case as of yet. I guess only time will tell who will play what part! I'll try to keep you posted when the news breaks!