David Goyer has offered a little incite into what he wanted to do with the Flash movie:
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For the record, the script did involve both Barry and Wally as The Flash. I wanted to showcase the legacy aspect of the hero -- as that was something that hadn't been explored yet in film. Like Batman Begins, the script drew on some seminal comicbook runs (Mike Baron, Mark Waid, Geoff Johns).
Shawn Levy has taken Goyer\'s place on The Flash. Levy is best known for his comedies which does not, IMO, bode well for this film. A flash comedy would be a mistake but then mistakes seam to be the norm on DC's Flash.

I take pride in my mental instability.
Go! Figure