At WWDC, Valve and HTC announced that their SteamVR platform would be arriving for macOS. This means that the HTC Vive can now be targeted by games that ship for that operating system, which probably means that game engines, like Unreal Engine 4 and Unity, will add support soon. One of the first out of the gate, however, is Mozilla with WebVR for Firefox Nightly on macOS. Combine the two announcements, and you can use the HTC Vive to create and browse WebVR content on Apple desktops and laptops that have high-enough performance, without rebooting into a different OS.
Speaking of which, Apple also announced a Thunderbolt 3 enclosure with an AMD Radeon RX 580 and a USB-C hub. Alternatively, some of the new iMacs have Radeon graphics in them, with the new 27-inch having up to an RX 580. You can check out all of these announcements in Jim’s post.