Definitely the same old sensor technology (higher ISO shots)...
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I own the 200 f/2 and have for some time now. It is my main lens that I use as it is just hard to find anything that works better (for me). As for a replacement, I can see where they would significantly reduce the weight and improve the IS by a few stops. Those two things alone would make it a great purchase but the MK1 will still be a great lens as well. I don't think a newer version would reduce the value of the MK1 so don't expect to see mine up for sale at 1/2 price.
Last month (Feb 22 Feb 2013) I bought the Tamron 28-300 VC lens (from B&H) for those times when I only want to carry just one lens mounted on my 5D MK III ... I am not sure if it was my copy of the lens or it is always like that, but that lens was very soft, made strange audible creaking noise when the VC & AF were being engaged and the AF point would jump after taking the shot ... so I returned it and bought a Nikon 18-300 VR lens & a refurbished Nikon D7000
Anyway here are a few images made with the Tamron 28-300 VC (mounted on 5D MK III) ... the firt and the third images are straight out of the camera ... the second and the fourth are after editing.
This lens should be under $4k. I guess there are people willing to buy it anyway, and so Canon will charge what the market will bear.
I don't know. It is a considerably more complex lens to manufacture than a 500mm f/4 or 600mm f/4, offers 200-400mm zoom at a constant f/4, and up to 560mm @ f/5.6 with the 1.4x switched in.
Besides, at $4k, there'd be no room for the 100-400 II!