I just upgraded to CC as my LR4 couldn't read the RAW (NEF) files from my D750. However, they are still not 'available'. I have no idea how to fix this....any ideas?
It should be in the next Lightroom update. The current version came out before the D750 came out. In the mean time you can convert to dng and edit your raw files in Lightroom just fine: Lightroom Support for Nikon D750 - YouTube