Valve just made a new Portal game...sort of. It's called Moondust and it's actually a virtual reality demo designed to promote the Knuckles EV2, Valve's new VR controller. It is set in Aperture Science's Lunar Resources Initiative so there's that.
You'll be working on the moon as an Aperture science robot sent to the moon to build space projects, explore the moon, and even drive around in a moon buggy. All while presumably dealing with the caustic corporate work culture of Aperture Science. Here's a brief trailer.
The demo is meant to take advantage of the pinch grip technology of the Knuckles EV2, so expect to grab a lot of things, finagle some parts together, and...test...stuff? It's all a little vague, but there should be plenty of things for you to do in the sandbox environment.
Valve even put up a design doc ont eh Steam Community forum which highlights the development of the demo as well as the integration of the Knuckles EV2 controller. You can see the Knuckles EV2 test in a separate video below.
The Knuckles EV2 is Valve's motion controller similar to the controllers used for the Oculus VR headset. The Knuckles EV2 has its own refinements and quirks, including a touch interface similar to the Steam controller.
Last year Valve boss Gabe Newell teased more projects from the Portal universe, but since this is a demo it's hard to know if this is one of the things he was referring to. We're still holding out for more cake you know.