I've been seeing a few of these monitors available on Amazon from time to time. Qty is extremely limited. The description seems to be completely wrong, but this is the Acer XR38 monitor. Mine arrives tomorrow.
37.5" UltraWide QHD (3840 x 1600) Curved Widescreen with AMD FreeSync Display
Refresh Rate: 75Hz - Using Display Port
Response Time: 5ms
Pixel Pitch: 0.229mm
Signal Inputs: 1 x USB 3.1 Type-C Port, 1 x Display Port, 1 x Display Port Out, 1 x HDMI 2.0 & 1 x MHL 2.1
The Aspect Ratio is 21:9