As long as there's a big bad enemy of some kind that isn't just an army of humanoid type aliens then I'll be happy. I know they can't top Reapers, but Reapers made ME for me, I want something big and epic.
Also, I saw someone say on reddit that it fits with the rumoured storyline of "Shepard's "Plan B" before the final Reaper push was to send a small band of N7 soldiers, and aliens to build a new life in Andromeda if all else failed in the Milky Way." which imo sounds promising.