There are over 1,200 speaking roles in Mass Effect: Andromeda. The news comes from PAX East 2017 where game producer Michael Gamble spoke about the topic in detail: 

"The lines of dialogue we have in Andromeda is like Mass Effect 2 and 3 combined. So the number of characters is vaster, but the amount of stuff you and that character can talk about is also larger — especially the squad, we definitely focused in on the squad."

Sounds like there is going to be a lot of options for players to explore in this game! Mass Effect: Andromeda releases March 21st. 

Source: IGN