personally i'm more hoping for ME:A2 to introduce more new species, instead of mostly bringing back old ones. It's weird how the Milky Way Galaxy has like 10 different main species but Andromeda so far has like 2-3.
Well, to be fair, we've only explored the Heleus cluster of Andromeda. That's less than one percent of the galaxy. To be honest, it's quite a surprise we even came across that many already.