According to this page on Samsung's Developer Site:
You will need the following hardware to develop for Gear VR in Unity:
Samsung Gear VR Innovator Edition for Note 4 and Samsung GALAXY Note 4
Samsung Gear VR Innovator Edition for S6 and Samsung GALAXY S6 or S6 Edge
Is the Innovator Edition required for development?
Or can I use the new Samsung Gear VR for development of VR apps, games and experiences?
It seems as if this page simply hasn't been updated, because the S6 is mentioned when the s7 is already available, but I want to be sure before getting started.