An interesting and completely pointless feature, given that there's no 12 bit (native) content it could display. But as a result, it'll require an additional processing step to add information that's not there in the source content. The increase in bit depth is at the wrong end of the video pipeline!
This is from Samsung's blurb -
"Neo QLED increases the luminance scale to 12-bit with 4096 steps; this helps make dark areas darker and bright areas brighter, resulting in a more precise and immersive HDR experience."
Er, nope and nope. Increasing bit depth, even to just the luminance scale, which is odd in itself, will not give darker dark areas nor brighter bright areas. It'll just give more graduation in each colour, or between black and white, if it's just the luminance scale.
It's not like Samsung to blatantly lie to its customers...
I'm not sold on the number of dimming zones, or lack thereof either. At most, the 4K version could have 2500 dimming zones, according to reports. That's still 3318 pixels per dimming zone though, so blooming and clouding are still very much likely to be a thing. Seems like just a marketing exercise to tide those over who must have the 'next big' thing, until a true leap forward like Micro LED becomes affordable.
I totally agree that 12bit panels are pointless at the moment and don't see why people need 48Gbs ports on a native 10bit display other than the bragging rights. Clearly LG and Samsung took the same view and only used 40Gbs ports on their 2020 line up. I still don't get why the PS5 outputs 12bit 4:2:2 content (so doesn't work with our Samsung TVs at 120hz) as that seems to be adding processing and then sacrificing colour information to fit into the 4L8 FRL available bandwidth?