Personally, I'm expecting some sort of noise about the next Mass Effect - it's been over 2 years since ME3, tweets were coming out last year about it being "playable", so I'd be pretty surprised if they don't at least do a 15-30 second teaser with music and the title card. At best, it'll be an actual trailer that gives some sense of what it's going to entail - will it be a prequel or a sequel, and if so, how?