First read this.
Second I don't use Nvidiot cards so I have no experience with them. However Alastair just installed 8.0 yesterday and he does. I will ask him if he is online tonight.
I do know of people running them on 8.0 and they apparently work. At least for some people, but not for everyone. Until Nvidiot releases 8.0 specific drivers it will probably be "works for some".
This is the problems you have when you have to rely on binary kernel modules.