What type of devices will the Surface Dial work with?

[James Falconer]

I missed the Surface Dial portion of the keynote earlier today. So, this is a bit of a NEWB question, but what devices will the Surface Dial work with? Only Microsoft Surface products? Or is it open to other integrations via Bluetooth as well?

 

[drddas58]

Surface pro 3 & 4, surface book and surface studio, nothing mentioned about integration with other devices