Sony already has a HDMI 2.0 chipset this is going into their latest 4K UHD TVs and their new 4K projectors. A Sony rep at the IFA trade show in Berlin (September 2013) said the PS4 will also have HDMI 2.0. This initial Sony HDMI 2.0 implementation is not a full capability HDMI 2.0 as it is limited to 10.2 Gbps data rate/bandwidth while the HDMI 2.0 standard (approved Sept. 2014) allows for up to 18 Gbps. I have recently published a blog (HERE
) that shows the 4K UHD signal formats allowed by the HDMI 2.0 standard at both the 10.2 Gbps and the 18 Gbps bandwidths. In any case if the PS4 comes equipped with both the HDMI 2.0 output and a Blu-ray ROM drive that support the BD-XL formats then it should be possible to have a future firmware update to add support for playback of Blu-ray 4K discs.
There are two standards under development that must be completed before Blu-ray 4K can become a reality. First is amendment 1 to the h.265 standard for the HEVC codec. While the basic HEVC codec has been defined by the already published version of h.265 there are 4K UHD related extensions being defined to support higher bit depths, higher frame rates, 3D, etc. This amendment is due out in about two months. The BDA is also developing the spec. for the next generation of Blu-ray, which is expected to use HEVC for 4K video, and it is on a timetable to be completed in early 2014. If these new/updated standards are completed on time then it should be possible to have the first commercial Blu-ray 4K products shipping by 4th quarter of 2014.
Thus, I don't expect to see the first BD 4K discs and standalone players coming to the market before this time next year. Given Sony's history with upgrades to the PS3, we may not hear anything from Sony about PS4 compatibility with Blu-ray 4K until perhaps a year from now.
As for the remote to control the Blu-ray player function on the PS4, I assume a new remote is in the works and it will probably be more complete with improved functionality for also controlling the Sony movie download service and other web based streaming services.