Sony has given its fullest set of answers so far to its vision and strategy for 4K, robustly supporting the format in a detailed question and answer session
Interestingly, in answer to the question "What other 4K products and services does Sony manufacture?" it doesn't mention the Playstation 4, even though it is believed to support 4K and is expected to play a large part in Sony's 4K delivery strategy.
Click through to see the whole session, and look closely at the comments where Sony is asked about upgradability to HDMI 2.0. They decline to answer, responding that HDMI 2.0 is not out yet but also saying that they will provide the answers in their next Q&A session