Hopefully they don't end up making unnecessary characters bi like they did in DA2. I've heard rumors. The bi-hetero ratio was dumb and is unimmersive in DA2. Liara's and Asari's case has always made sense, despite asari looking extremely female (probably a bit for titilating purposes, but it's neat).
I'm all for adding new bi, or homosexual characters. Just, if they're going to try and convince you a past character is suddenly bi, or make everyone bi that's just dumb.
the trailers good though.