Not sure about ME, but I'm pretty sure the next DA will definitely have more story important LGBT characters since the DA crew seems to care more about equal rights than the ME crew does. Besides, it doesn't really matter to me if the story important character is straight or a bi who only shows interest in the opposite sex save for the PC - they're essentially the same thing in my eyes. I'd rather have gay side characters than bisexuals like that.
Aside from Mac Walters, Yanick Roy, and Jos Hendriks, most of the devs from BW Montreal are new ( + some people from the DA team). That studio mostly helped out with ME3MP, and some ME2, ME3, and DAI DLCs. We don't actually know how their work will stack up compared to DAI, since they've yet to release a full game developed by them.
But judging by the fact that Manveer Heir (who's passionately speaking out against sexism, racism, and homophobia in video games, and campaigning for more diversity) is in a way representing BW Montreal, I'm guessing we'll have a quite different atmosphere than that around the original trilogy (I'm still slightly irritated by 'Shepard can be anyone you want, except a gay man'). Both EA and BW changed since 2012, having more important LGBT characters is encouraged on the level of both the studio and the publisher. So maybe this time we'll get a bisexual guy, who's more into guys, or a gay alien, who's crucial to the story.
The new IP, on the other hand? That I'm slightly concerned about. But I'm not going to worry about that just yet.