They are mainly meant for content creation, as Powerpoint and Paint 3D were shown as some examples. They do not use external tracking at all such as cameras or lighthouses, but internal 6-point tracking (head tracking only?). No info just yet on gaming compatibility.
Not really a huge announcement but definitely a sneak peek to how MS might jump into VR with Scorpio.
More info: http://www.theverge.com/2016/10/26/...aphic-virtual-reality-headset-announced-price