According to The Huffington Post, Netflix’s Chief Product Officer Neil Hunt suggested as much during a press conference about Netflix’s support for High Dynamic Range technology, saying that "Sony had promised a PS4 hardware revision that would give the console 4K video capabilities."
Forbes followed this up and it seems that no-one is giving away their plans at the moment. Indeed Sony told them that “Support for high-resolution 4K output for still images and movie content is in consideration," while Microsoft said, “We remain committed to bringing leading entertainment features and services to the living room," although also added, "Beyond that, we have nothing to share at this time."
@_wotta commercial UHD streaming services like Netflix & Amazon that use HEVC. Everything I hear about HEVC is that is needs dedicated chip.— John Archer (@BigJohnnyArcher) February 2, 2015
@_wotta A firmware update MAY give some sort of 4K Vid support. But neither myself nor, it seems, Netflix believe this wd stretch to...[1/2]— John Archer (@BigJohnnyArcher) February 2, 2015
@_wotta For instance, so far as I know no TV has been able to deliver a 'firmware' solution to HEVC decoding. Love to be proved wrong tho!— John Archer (@BigJohnnyArcher) February 2, 2015