Sharp not even joking, announces 5.5-inch 4K IGZO display with mind-blowing 806ppi pixel density
not even 2 years after 2K mobile screen was first announced

Full RGB unlike the rumoured Samsung 4K OLED which is likely pentile.
It'll have huge implications for VR which currently suffers from screen door effect.
IGZO is supposedly more power efficient than TFT/IPS/OLED so I hope it'll make it to phones released Stateside/Canada.