Quote Originally Posted by Pieter
The nikon 200-400 costs $6800, so the Canon won't be much less.

Much more... I'm going to guess $8500, and even that might be on the low side. Consider the pricing on the new 300/2.8 II and 400/2.8 II. If Canon follows suit, I'd expect this to be a couple of thousand more than the Nikon counterpart, especially since the extender is built-in.