Touchè.
Apart of me really hopes that all of the races from the original trilogy is going to make a comeback. I would probably throw my monitor out the window if the Asari didn't return 
I suspect our new squad and crew on the tempest will probably reflect this, maybe having one of each race while all the other NPCs we interact with inhabiting Andromeda will be new. But to be honest, the ones that I only really gravitated to were the Asari, Turians, Salrian, and Krogan. Maybe Quarians too.
I'm getting pretty excited for Andromeda - being in a totally unknown, new galaxy definitely brings it that frontier, colonial aesthetic. How Bioware is going to brand that into Mass Effect will be exciting to discover 
I'm one of those boring people who dislikes speculating without information and facts, but I'll try...
If the reason for leaving the Milky Way was a kind of "Noah's Ark" mission from the Reapers then I could easily see most of the major Citadel races making a reappearance. That would be the asari, salarians, turians and, of course, the humans. It'd probably include the krogan too, and maybe the quarians.
I'm fond of the Noah's Ark theory because it'd be a way to start fresh, completely fresh, but also have a strong connection to the original trilogy that doesn't change depending on the choices you made. Whether or not the theory has any kind of merit, I have to believe that the races native to the MWG left before the end of the Reaper war. I'm having trouble imagining ways the writers could address all the different endings without being totally cheap about it. I personally didn't kill Leliana in DAO, but I can understand the frustration those who did had when she popped up again in DA2 and DAI with very little explanation. Let's not do something like that again.
I'm excited too! I can't wait to see what they have planned. And as much as I love the old races, I'm looking forward to meeting the new ones. (As long as it's with blue ladies by my side, of course...)