Maybe it's a subtle hint that the drell will be making a return in ME:A, and maybe there will be more than 3 and females too! Maybe? In about 3 months we may know.
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Yes, of course.
However, I posted a link from an interview with two senior Bio managers (Flynn and Walters if I remember correctly-- Sept 4-5 2015 interview), in the SQUAD thread I think. They said the game will have seven NEW characters. That the Tempest (our hero's ship) has room for seven and each has a loyalty mission.
Add another quote from Bio that said the studio is serious about treating all characters equally, I came up with the following romance options:
3xmales, 3xfemales and (1xAsari <= could also be the new alien LI) or the seventh character is the hero which can be M/F.
I found the Drell to be a minor influence, in Citadel politics. With that in mind, I doubt Bio would put them in the ARK. But, one can be surprised.