They advertised this a bit at SDCC (and had a huge banner outside in the entry hall), but here is the red-band trailer for Legion (which means bad words ahoy, so maybe keep it down at work. Especially from you, granny. Sheesh). Of course at 5+ minutes long it's not so much a trailer as it is probably most of the good parts.

Who wants ice cream?

Sure, it kind of looks like Constantine and The Prophecy (minus Christopher Walken, unfortunately) got together and made sweet sweet love to each other, but I think it might just be a good time at ye olde cinema.