Played the first area, well wow? The fluidity and frame pacing etc all perfect, not a single hitch in gameplay, the framerates are very high too with 4K DLSS-P and it looks superbly crisp and detailed. Note for OLED users, set the transfer function type to sRGB instead of 2.2, 2.2 has the washed out look which sRGB resolves though black isn't pure black given the colour grading used artistically.
Frame gen works excellently as well, and there is no mouse input latency or anything like that, it is just insta-responsive.
Controller motion and panning is also very precise and smooth with ample granular movement damping.
Technically and mechanically IO Interactive have seemingly hit a home run and this paves the way for a super path traced experience, too.
Spot the difference
DLAA + 2xFG:
DLSS Performance + 2xFG:
Look
@Nexus18 
No reflections weirdness given no HWRT, only a custom SWRT method IO created for this game's Glacier engine version as per DF tech review:
Credit where due, this is great on a technical level and looks nice too, not The Last of Us nice, but Uncharted nice so far.