As cool as the promo below is, Supergirl is obviously not part of it due to the fact that her show will air on CBS. While it at one point appeared to be heading to The CW, CW president Mark Pedowitz explained today at the Television Critics Association press tour why they decided against moving forwards with it. "We hadn’t launched The Flash yet, we weren’t ready to take on another DC property. In hindsight we probably should’ve gone that direction… Sometime you lose great shows." They really should have, especially as it would have made Supergirl standing alongside Green Arrow and The Flash a lot easier! So, will a crossover happen? "I leave that to (Supergirl/Arrow/Flash executive producer) Greg Berlanti if they can make it work," he said. "I’m open to crossovers." So, it sounds like it could happen at some point! Stay tuned for details...