The Latino Review website seems to have it on good authority that actor Scott Porter (Friday Night Lights) is a favorite in line to be cast as legendary DC speedster, The Flash. Regarding the list of possible names, it stated:
"We've received word from a very-reliable source that actor Scott Porter is one of those actors. If you'll remember back in the Fall of 2007, Porter auditioned for director George Miller for his (now dead) Justice League: Mortal and was said to be a top candidate for Superman."
It is actually still uncertain if this casting will be for the (rumored to be dead) Justice League: Mortal or a feature film starring the red-streak vigilante himself. The aforementioned Justice League film, was rumored to have cast Adam Brody (The O.C.) as the Flash, among a complete cast of new actors portraying classic DC Superheroes (even young actor, Armie Hammer as Batman.) Those were just loose rumors and even the current gossip surrounding a solo Flash film brought up the name of Neil Patrick Harris as another casting possibility. (Although his casting would likely mean the film would have a tounge-in-cheek, humorous atmosphere.)
The cold hard fact is that the Flash cannot possibly carry a film on his own. He is just not that interesting. The greatest example of this was the 1990 attempt by CBS to capitalize on the post-Tim Burton Batman craze with The Flash television series. It was draped with all the dark themes and visuals that were a signature of the popular 1989 Batman film. However, people never quite bought it. Despite being somewhat of a decent series, it unceremoniously disappeared. (With no long, red streak to follow.)
Unless film executives have gotten complacent about the success of The Dark Knight, a film with the Flash is only going to happen with him as part of the Justice League.