Sony's first 4K TV set has been priced at $25,000 (£15,700) in the US. Available to pre-order now ahead of its release this November, the 84-inch XBR-84X900 has a 3840 x 2160 resolution - that's four times the pixels of full HD.Other key features include 3D viewing, a virtual 5.1 surround sound field and online connectivity through the Sony Entertainment Network. Get the full tech specs here. Just as the PS3 played a key role in establishing Blu-ray and later 3D content, PlayStation 4is expected to form part of Sony's plan to push 4K tech out to consumers.