User blog comment:The Boomerang/New Angry Birds Movie Pictures!/@comment-26831256-20160205000752/@comment-4794476-20160205142259

That's entirely speculation. There is no clarification that Piggy Island and Bird Island are the same place; and Willow still appears in the trailer and it hasn't been confirmed at all that she was born in Golden Island. The secondary flock (Hal, Bubbles, etc) also appears so that is additionally false. And last point, this blog was made many months back so technically this is a spam comment.