So we know that Mass Effect: Andromeda is due for release sometime early next year. But outside of some teaser footage, and a video to showcase the deep space-cave blacks of the PlayStation 4 Pro, we haven't really seen much of the actual game. A full reveal and expected release date is still scheduled to happen next month, but in a weird case of 'product description' Dark Horse Comics' Art of Mass Effect: Andromeda' book says that it will be available simultaneously with the game - March 21, 2017.
So yeah, no inside source, retail snafu, or marketing plan leak here. Just the excited product description from an art book that will release alongside the game - "Dark Horse will release The Art of Mass Effect: Andromeda simultaneously with the game!"
We expect to learn more about Mass Effect: Andromeda on N7 day next month, that being November 7.