There seems to be a ponified Star Trek trailer on YouTube already, but luckily it's based on a different trailer. I used the one I considered most epic, think it's officially trailer 3 (?). 

Original Star Trek trailer: http://www.youtube.com/watch?v=P0xaCB2nLS0

Still so much good MLP footage left, but finding epic game/movie trailers to work on isn't quite so easy. If you have an awesome trailer on your mind - preferably something that doesn't have a pony version already - do let me know!  Many good ones have already been made approximately 1/5th cooler, such as Mass Effect 2 and StarCraft 2. Damn, I would've wanted to do those!