Nah i really hope The dude who was in the punisher would play Batman. The first punisher, not that war zone shit.
Henry Cavill looks like he will be great as superman, NH. If Man of Steel isnt in the JL Movieverse then i dont know who i want to play Supes.
Chris Pine would be a good Flash imo. He has the witty attitude and humor but can play a serious role too.
For the rest of them i have no idea who i would cast.