Alongside its wireless charging-capable iPhone 8, 8 Plus and X models, Apple showed off its upcoming AirPower charging mat during yesterday’s keynote. While the accessory won’t be available until next year, it will be large enough to allow users to charge iPhones, Apple Watches and AirPods on a single pad (provided users have the new compatible AirPods case). The company didn’t say how much the charging pad will cost or a specific…