A source tells the site that West has not been involved with Respawn's first game, published by EA, which will likely make an appearance at E3 this summer. The source asserts that West has actually been gone since the settlement of the Activision/Infinity Ward lawsuit last year.
Update: On the official Respawn site, fellow co-founder and Infinity Ward-alum Vince Zampella has confirmed the news of West's departure.
Jason has left Respawn to take care of some family issues. We have worked together on some amazing accomplishments over the years, starting with an early Segasoft project that never shipped. It is sad to see things come to an end, but there are times when change is best for growth, both personally and professionally. I wish Jason the best and send my best wishes to his family. Respawn continues to amaze me, the team here is resilient and talented. E3 will be therapeutic for us, as we finally get to start showing our work again. I know the team was excited about the response we got from just admitting we were going to attend.