IESB has another rumor report up regarding the Justice League movie, this time a live action version again. Grain of salt and all of that applies - but here's the highlights:
Batman in - but no Bruce Wayne (allows recasting of the part easier)
Superman - WB wants Tom Welling
Flash - Ryan Reynolds (Wally West version)
Martian Manhunter - WB wants Laurence Fishburne
Timm/Dini Justice League cartoons are a big inspiration for the script, white martians are rumored as well.
Again, just a whole mess of rumors, probably not true - but food for thought for now. More at the linky, if interested.