From audible.com:

With a new game, Mass Effect Andromeda, set for release in 2017, the launch of a new series of Mass Effect novels is timely. The new game will take the story in a dramatic new direction and is set in a new region of space, with a new and deadly enemy.

Titan is publishing four unmissable Mass Effect novels. The novels will act as prequel and sequels to the events in the games and will become part of the overarching Mass Effect saga. These new stories, developed in close collaboration with the Bioware game team, weave directly into the action of the new game - and will reveal events kept secret over the course of game play - and will add to the canonical Mass Effect saga.