The SDK will be sold for $150 but there are just 50 units available. If there's sufficient demand, Logitech may build additional kits. More info at the Vive Blog.
The result? We’ve created a way for the HTC Vive Tracker to represent a keyboard across the Steam VR system. It is this software piece that presents the user with an overlaid virtual representation of their keyboard in any VR application, complete with animations when keys are pressed. It’s compatible with all apps that are developed based on SteamVR. The developer’s application does not need to manage anything, the overlay appears automatically as soon as the associated Vive Tracker is turned on. It also affords the opportunity to skin the keyboard in a variety of ways, as mentioned above, allowing developers to create unique experiences for their communities.
Our work didn’t stop there, we know that for a true typing experience you need to see your hands, and we’ve created a way to use the Vive’s existing tracking to do that. We’ve put in a lot of hard work to develop this experience so far and we know it can go much further with the creativity of the developer community.