Sony and its retail partners are now shipping the new WH-1000XM4 wireless noise-cancelling headphones across North America and Europe. Sony launched the much-anticipated cans at the beginning of the month and began accepting pre-orders. Now it will ship next day delivery to your door in markets like the US and Germany and in a few days in the UK. The Sony WH-1000XM4 cost the same $350/£350/€380 as the WH-1000XM3 but bring a few improvements. Key among them is the ability to pair with two devices and switch on demand. The new QN1 chip that does the active noise cancellation magic has...