From his Twitter:
After 8 amazing years at BioWare I have made the decision to move on and have accepted an exciting opportunity at another gaming company. Since the first time I played Baldurs Gate many many years ago, BioWare was the dream place I always wanted to work.
I will forever be grateful to all the people who gave me the chance to work on great products with amazing people. I believe Anthem has a bright future - there is a great team working on it and I look forward to following its progress (and playing it!) from the sidelines.
I have really enjoyed interacting with the Anthem community - Streams, Twitter and Reddit. Through the good times and the tough times. You all are in great hands with @Darokaz and @UNTDrew (and have been for some time now). I wish nothing but the best for all of you. Ben.