Formal reviews of the S23 Ultra are now starting to come out including this one. We just got our sample today but haven’t started testing yet.
So now for a short rant, from this review, which is that I wish reviewers would actually take the time to learn more about the technical aspects of what they review 
This one about the display especially annoys me.
“The real upgrade is brightness. The screen puts out between 1,200 nits (typical) and 1,750 nits (peak outside). That’s dramatically better than the 1,200-nit max of last year’s S22 Ultra, though it falls short of the 1,600 nits (typical) and 2,000 nits (peak outside) of the iPhone 14 Pro Max”
This is just full of misleading or misguided information across the board. To start with, even under the best scenario 1750 nits max versus 1200 nits max is just barely perceptible generally. Brightness is somewhat similar to sound loudness where the increases are logarithmic in nature and not linear.
In other words 2000 nit will not look twice as bright as 1000 nit. Yes it will be noticeable but only mildly so.
And just to pile on, “peak brightness” is a much abused term in smartphones at the moment similar to contrast with televisions where with OLED they might report 1,000,000 to 1. Where in reality they sort of use pixels being black, aka OFF as the baseline and any high school algebra student can tell you about all the foibles of using zero as a base number for example trying to divide by zero.
Specific to phones, every phone make is different in how they arrive at their numbers and they include things like only a very small area of the total display (in Samsung’s case 5% and Apples’s 8%) nor do they mention that it’s quite brief, typically 15 seconds or less which regardless still has benefits for things like true HDR video content.
But to sustain those levels of brightness for much longer than that you risk your display melting, not to mention the power consumption hit…
Ok end of rant, but TLDR yes under the right circumstances the s23 will appear a bit brighter but it is simply is no way no how “dramatic”
And yes because I’m a display guy I probably obsess over this stuff a bit, but still…
2nd TLDR; The camera does seem to be improved somewhat over my s22 Ultra, but 200 MP does not mean it’s twice as good as my 100 MP unit. I can see some improvement in some but not all shots and like I said earlier, I stand by my opinion that the camera in the S23 Ultra is now roughly on par with the ones in the Pixel 7 Pro and iPhone 14 pro.
Samsung Galaxy S23 Ultra Review | PCMag
PS; I guess I was overdue for a tome again 