The long-awaited Sony WH-1000XM4 headphones haven't been officially announced, but we know all about the new cans thanks to a leak from a retailer. Sony's next-generation noise-canceling headphones have been removed from a list of Walmart products with brand new features. At the top of the list is something called "Edge-AI" for restoring lost detail in highly compressed audio files and precise voice capture that uses the five microphones in the ear cups and advanced audio signal processing to improve call quality. In addition to these recognized features, the Walmart page claims that the Sony WH-1000XM4 would have multi-point pairing, Bluetooth 5.0 and, of course, best-in-class adaptive noise cancellation. That said, they'll still use 40mm drivers, offer around 30 hours of battery life, and use a USB-C port for fast charging, the same as the WH-1000XM3. The listing had the price of the Sony WH-1000XM4 at €349, the same price that the current Sony WH-1000XM3 currently costs. If the price stays the same across all territories, you're looking at €349 and AU €419.