https://www.theverge.com/2018/6/22/17494332/valve-knuckles-ev2-steamvr-controller-development-kit-shipments-portal-moondust-demo

Valve has announced that it’s shipping a new version of its experimental SteamVR “Knuckles” controllers to developers, and it’s posted a lot of detail about the controllers online, including video of a Portal-themed playground for testing them. The Knuckles EV2 substantially updates Valve’s earlier design, and although it’s not a consumer product, it’s looking more polished — and even less like the earlier Vive controller.

The Knuckles controllers, originally shown off in 2016, give users a fuller hand motion range than most VR controllers. Instead of holding them, you strap them around your hand, so you can open and close your fingers normally without dropping the controller. Capacitive sensors detect when individual fingers are touching the controller, so you can do things like pick up objects by naturally closing your fist, instead of hitting a trigger or grip button.