Microsoft closed out today’s big HoloLens 2 debut with a surprise appearance by Epic Games CEO, Tim Sweeney. The gaming exec was clearly impressed by the technology’s future for both developement and consumer augmented reality.

“I believe that AR is going to be the primary platform of the future for both work and entertainment,” he told the crowd at the event.

The Fortnite creator is kicking things off on the development side, announcing that Unreal Engine 4 support will be coming to the headset. The move is part of a larger strategy for Microsoft to open the system up, as it looks to grow its key foray into the world of mixed reality.

For Epic, meanwhile, it’s part of a larger embrace of both Microsoft’s solution and all things AR. Sweeney noted that the company is not ready to announce any kind of consumer-facing AR offering, that they’re certainly on the way, and the company “will support HoloLens in all of our endeavors.”