A Mass Effect book has supposedly leaked the date for Mass Effect: Andromeda's release. Destructoid reports the Amazon description of the Dark Horse published "The Art Of Mass Effect: Andromeda" says both products will release March 21, 2017.
There's been no official confirmation on the news, however, it is worth noting the date lines up with Bioware's launch forecast for the game when they said it would be seen somewhere around Q1 of 2017. We will update you if the report turns out to be false.