https://www.techpowerup.com/305089/asus-launches-300-hz-27-inch-wqhd-rog-strix-gaming-monitor-with-displayhdr-600
 
For those that find a 270 Hz refresh rate a bit on the laggy side when gaming at 2560 x 1440, ASUS has updated its ROG Strix series of monitors with the XG27AQMR model. The R on the end of the model name denotes the higher refresh rate, as well as support for DisplayHDR 600 over the previous model in the series. Although the two monitors are said to be using a Fast IPS panel, the new model has a 1 ms Grey to Grey response time, whereas the older model is rated at 0.5 ms.

All the gaming features you'd expect to find are of course included, such are FreeSync Premium Pro and G-Sync compatibility, ELMB which can be combined with FreeSync and various other ASUS specific features such as GameFast Input technology and GameVisual. The inputs haven't changed from the previous model in the series either, which means there's one DP 1.4 port and two HDMI 2.0 ports, as well as a USB-B input and two USB-A ports, all supporting USB 3.2 Gen 1 speeds, or 5 Gbps. The stand supports tilt, swivel, pivot and height adjustment. No word on pricing, but the previous model retails for around US$650, so we'd expect a small price premium on top of that for the higher refresh rate and improved HDR support.
 
If the price is over 650 dollars then I would personally believe it is overpriced.