Question: Does the Surface Connect to USB-C adapter work with Surface Pro 4 or not?
Answer: Yes, the Surface Connect to USB-C adapter works with Surface Pro 4 according to Daniel Rubino (Executive editor at Windows Central)’s tweet. You also need to make sure that your Surface Pro 4 devices have the latest OS and firmware updates.
Update: After getting my Surface Pro 4 with the latest firmware/OS update the Surface Connect Type-C adapter is working with it too.
Will have to dig up ol’ Surface Book 1 to test that next.