Planning on getting this at some time, the demo was gorgeous. 4K @ 30 fps sounds good. This is a port done right!
http://www.eurogamer.net/articles/digitalfoundry-vs-trine-2-on-ps4
It runs at native 1080p at 60 frames per second - but that's just the beginning of the story. Frozenbyte's impressive Trine 2 has migrated to PlayStation 4 in fine form - not only does it combine the optimal mix of resolution and frame-rate, but it's the only game to support stereoscopic 3D, running internally at an effective 1080p120 in the process. Indeed, according to the developer, Trine 2 could even hit 4K at 30fps should Sony ever unlock the output of the PS4 to support ultra-HD resolution.
We thoroughly enjoyed our time with Frozenbyte's beautiful puzzle-based platformer when it appeared late last year on the Wii U, with the interesting physics-based gameplay mechanics and impressive rendering technology making it easy to become immersed in the vibrant and colourful world on display. However, with PS4, Frozenbyte has handed in the definitive console version of the game, with native 1080p visuals, 3D support and slick 60fps gameplay that is rarely achieved in the console space.
http://www.eurogamer.net/articles/digitalfoundry-vs-trine-2-on-ps4