An official announcement has been made about 4k.

http://www.joystiq.com/2013/02/21/ps4-will-output-video-in-4k-but-not-games/

That's what I wanted anyway, hopefully it'll be able to play UHD BDs, if that spec makes it through.

I'll probably get a RedRay for most of my 4k movie viewing anyway.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris