Take with a pinch of salt as the video is sponsored by Samsung...
The colors looked good but.. I can't put any value on it because it's a Samsung demo. Have to wait for real reviews using two calibrated panels.
The only 2 bits of good data I could find in the video is:
* QD-OLED has crazy good G2G like normal OLED - LCD gaming monitors are dead, there is no hope for them. You'll see all competitive gamers will switch to QD-OLED this year and next
* The brightness may not be up to what some people wanted. The QD-OLED TVs and gaming monitors all peak at 1000nits in a small window and 200nits in full screen window. So basically the brightness is about the same as LG OLED TVs on paper - the gaming monitors will have an advantage as all other OLED gaming monitors to date peak way lower than 1000 Nita. So even though an QD-OLED TV will be no brighter than an LG OLED, the QD gaming monitors will be brighter than any LG or JOLED gaming monitors to date