made a bunch of photos with the new nikon d800. 2 out of 14 nef files cannot be imported with lightroom 4 while the other 12 import fine.
I believe what you have is a known issue. If you shoot stills in live view video mode, those NEFs will not import. We are working on a fix for this problem. Thank you for taking the time to report it.
To be specific: still pictures taken in the Live View "Video Mode" cannot be imported into Lr 4.0. However, still pictures taken in the regular ("Stills") Live View mode can be imported fine. And of course, pictures taken in regular shooting mode (not Live View) can also be imported fine.