Devs aren’t allowed to let Apple’s Vision Pro dev kits out of their sight. Apple is taking several steps to help developers prepare their apps for Apple's new Vision Pro platform next year, above and beyond the Vision Pro simulator that comes with the Xcode development environment. One of those steps is actual pre-release hardware in the form of the Apple Vision Pro developer kit (DK). https://arstechnica.com/gadgets/2023/07/here-are-the-rules-for-apples-new-vision-pro-dev-kit-your-family-cant-see-it/