Developers have uncovered code in the latest preview version of Android P and the accompanying Google app that reveals the existence of the Pixel Stand. The new hardware from Google will accompany the Pixel 3 models on launch in Octover as an accessory designed to support wireless charging.
https://www.notebookcheck.net/Wireless-charging-Pixel-Stand-for-Pixel-3-confirmed-in-code.318740.0.html