Nikkor 180-400 w/1.4x
Nikon just made it official, the new 180-400VRII with built-in 1.4x. The replacement for the 200-400VRII boasts a lot of new features including the first built-in teleconverter for a Nikkor lens. Weighing 5oz more than the 200-400VRII, with the 1.4x in use, the maximum aperture changes from f/4 to f/5.6. Full specs can be found here.