A light at the end of the tunnel?
I spoke to someone at NAB last week about the yet-to-be-officiall-announced EF 200-400 f/4L IS 1.4x. I was told that the lens is now “expected to arrive in the fall of 2013. The design and functionality of the lens are set, Canon is now waiting for the manufacturing process to be finalized so production can begin”.
I got to hold and play with the 200-400 a bit last week, and I must say the weight of it shocked me. It's going to be pretty close to the EF 600 f/4L IS II. I'm sure everything else about the lens is top notch, as we're still being told to expect a price north of $10,000 USD.