Alienware presented a 55-inch OLED gaming monitor at CES 2019. Due in the second half of 2019, it supports 4K@120Hz, HDR, VRR, and more.
It will come with DisplayPort 1.4 and HDMI 2.1 ports.
Source: N4G PC Alienware OLED Gaming Monitor Due in 2H 2019 – 55", 4K@120Hz Through DP 1.4 & HDMI 2.1, HDR, VRR