Alright. First, MP will be a thing in Andromeda, was successful in ME3 and they already implemented it on DAI (although I didn't actually tried more than once, didn't quite like it in DAI).
Will it be separated from SP? that's almost a fact, no one liked that "feature" back in ME3, they're not bringing it back. Also, it doesn't make any sense tbh.
I'd love to discuss classes, weapon balance, IA, modes and whatnot, but it's too early for that I think. Instead I will say this:
We need dedicated servers. Bioware, if you truly love your fans, add dedicated servers. ME3 was a mess because of the "host benefit" 90% of the time It was awful to play as non-host. So please.
This is not a test anymore, you couldn't know how things would turn back then. Turns out people loved ME3 MP. So having dedicated servers in Andromeda would make things much more enjoyable.