I finally got around to watching the flash and I really don't see why some people are begging for Sasha Calle to come back given what she was given to work with in that movie. I thought most of her scenes were mediocre at best.
Hopefully it's a clean slate, but from Gunn's instagram post, it's sounds like it's already written. Part of me wants them to build out a superman universe as opposed to a DC universe. Between Supergirl, steel and Superboy, I think they could do something special. The thing about DC is that each character almost has the opportunity to build out their own world's.