The PS3 can output 4K but it's considered a HD Console. You might ask yourself what makes the PS4 a UHD Console.
UHD does require standards like HDCP2 in the TEE, AACS in the TEE...a TEE for pitys sake, HEVC profile 10, HTML5, HTML5 <video> EME MSE etc.
Vidipath which Sony and Microsoft are going to support also has requirements like HTML5 for the UI, HTML5 <video> MSE EME for the Video player and Playready (requires a TEE) + WMDRM (requires a TEE or as Playready 2.5 a Hypervisor protected memory and process) which is in the PS4 intellectual notice. 1080P and 4K media streaming requires Playready ND (requires a TEE) and that is mentioned in the UHD Blu-ray digital bridge proposals (All media conversion is required to be done in the TEE) and by Microsoft in Game Consoles to support streaming and Live play from a DVR.
For the
PS3 a PDF on Passage was just released at the latest FCC DSTAC (Downloadable Security Technical Advisory Committee) meeting. Page 12 has a chart showing a PS3 being used as a Vidipath STB. The Downloadable Security scheme also requires a TEE.
Top path is RVU which the PS3 already supports.
Direct Attach End to End (center path) which is all IPTV direct from a cable modem . The future but Cable can't currently support more than a small percentage of their customers going all IPTV.
Sony is definitely supporting Vidipath, page 12 bottom path (Traditional Cable TV with the DLNA CVP2 FCC mandate where a DVR with tuners converts a RF channel to IPTV streams ) This is why Sony was porting Playready embedded to the PS3
Second Sony Passage Paper to the FCC DSTAC is about using clear QAM tuners (USB, PC Card and Network tuners) with PCs, PS4, Phones and Tablets as the client using the DSS (Downloadable Security Scheme) (page 10 and 11). A picture of the PS3 labeled PS4 on page 11 is using a
Hauppauge USB Tuner. Also on that page is a HD Homerun network tuner feeding a home WiFi router to portables.