1080p is a bit low, but that also allows less detailed graphics to look good enough, which makes it easier to maintain 120 fps.
It's a single 1920x1080 screen, 960x1080 per eye over a 100 degree field of view. With tv you don't get more than 30 degree field of view when you sit close, 20 is closer to the norm. So really what you perceive is less than 320x360 per eye compared to what you're used to on tv. PS3 level graphics will be more than detailed enough.
You got to start somewhere. Tripling field of view, quadrupling the standard frame rate, it won't be compatible with current ps4 games. Which is fine. VR games need to be designed from the the ground up.
Anyway Wipeout HD and GT6 on Morpheus, I'm ready. Or GT4 and Wipeout Fusion, fine too, whatever works.