I have one D80 NEF file provided by a Nikonian. I can get (hack) the file to load in ACR3.4(x89) but there is one (insurmountable) problem. For some reason, the Color Filter Array (CFA) is in a different order than ACR expects; so Red and Blue are interchanged. Entertaining but not useful.
I'm sure Adobe will have a update shortly. It is not "rocket science".
It's quite disappointing that D80 isn't included with the raw 3.5 update. If Nikon and Adobe were truly cooperating as they claim in their press release, you would expect that it could easily have been released with 3.5.