I'm sure that all big races will be in the game (Salarian, Korgan, Asari and Turian). I mean if the council approved such a project I'm sure the Turians with their military expertise will come along.
My hopes are still up for some Quarians (they were rare to encounter outsite of their Flotilla already. I think we only get to meet one male on Omega, and a female on the Citadel and on some Asari Planet I think, so the chances are small but still there are some. I mean I can imagine that some other races hired them for their tech knowledge even if they are not popular among them.) and the Volus because I can imagine they have high interest in opening up a new market.
Maybe we get to see some Hanar as well to bring the word of the enkindled to other places.
But I have little to no hope for the Elcor (because they already hate traveling in the milky way, so I doubt they are up for a new galaxy) and the Vorcha, because they offer nothing and alone have not the means for such an expedition. I really wish to see the Drell and the Batarians again and maybe finally a Raloi but I have no arguments for why they should come along.