I am sure Nikon will meet their promise of noise reduction equal to that of the D700, as anything less would be a disappointment.
At present everything is hypothosis, absolutely everything! I am guessing that it will be a short time from delivery to the first posts appearing here and that any meaningful images data will be available. In the meantime I don't think it's worthwhile interpreting anything from the sample images posted on sites elsewhere. Personally, I'd trust the posts here rather than those posted by unknown names on sites elsewhere. Real world stuff, posted by real enthusiasts.
When the first images are posted here, then it will start to build the roots of meaningful discussion. Personally, it's the lower light high shutter speeds at higher ISO's (800-1800) and those particularly in DX mode that I am looking forward to and those will be eagerly awaited.