Well, "IF" it's true that there is no stray backlight "glow" from the corners with fullscreen "very dark gray", then it would be the first LCD I've heard of which didn't have the problem (this includes full array LED backlights from past LG models, I myself own the 55LH90, which is a full array LED backlight with local dimming and it too has some backlight "glow" at near-black full screen video display).
However, it's far less noticable when other brighter content is showing to offset the visual difference. It's more noticable when the whole screen is just dark enough where the backlight must be "on" and displaying very low level content. At full black, the backlight simply shuts off and it's a nice jet black. When there is full black content mixed with other higher light content, the local dimming sometimes responds correctly and shuts off the specific sectors, showing a jet-black, while sometimes, it doesn't dim the sectors low enough. I think my early model local dimming design has a less accurately programmed local dimming behavior and so it's not always recognizing when to dim certain sectors sufficiently.
I believe the new generation sets very likely have better programmed local dimming behavior. However, it's difficult to get rid of the backlight bleed because it's usually caused by a very faint reflection off the LCD-glass layer, which (it's my understanding) is a part of the LCD design on EVERY LCD tv. The only way to limit backlight bleed would be to design a glass layer which allows light thru the glass at the proper prime display angles while minimizing reflections from the glass in the same prime viewing area. (In other words, test out methods to limit reflections from areas behind the glass at angles you don't want light reflecting from, while preserving the light transmission from the direct source light in that sector.) This would also largely cure clouding.
To my knowledge I haven't read about any company that has successfully designed an LCD which cures backlight bleed or clouding.