New 4K Sony TVs are Android TV and I suspect that Sony will allow cross play with the PS4. It then would be an artificial barrier if they don't allow the PS4 cross play with other Android/NX/ ARM game consoles. Sony has plans, I believe, to allow the PS4 to support Playready ND and media sharing over the home network with iOS and Android platforms; Phones, Tablets, TVs, STBs...likely UHD Blu-ray digital bridge too. Game and Media sharing over the home network and outside possibly with DTCP+.
This Playready, Playready ND, Vidipath sharing is I think part of the Microsoft-Sony.com domain registration that happened within weeks of Sony choosing Playready DRM for all their platforms (June 2011).