Nikon D6 has a Nikon F lens mount and currently there are 309 native lenses available for this mount.
Nikon D6 doesn't have a sensor based image stabilization system but 70 of these lenses already comes with optical image stabilization.
Since Nikon D6 has a Full frame sensor, it has a focal length multiplier of 1x so lenses will provide their original focal length on D6.
You may also also be interested in these:
Nikon D6 Lenses with Image Stabilization
Nikon D6 Lenses with Weather Sealings