The 5DIII was targeted to event and wedding photographers who need clean images at higher ISOs. They won't be upset when this surfaces.
... but still many will because they shelled out $3500 to get the latest gimmick on the block, and the arguably the "clean images at high iso" advantage compared to the 5d2 is minor and the 3d shows a real step forward.
Another feature mentioned about the camera is better heat dissipation of the sensor compared to other EOS cameras. Apparently, this results in industry leading low ISO performance.
"Heat dissipation" is the real problem of eos iso noise (not another sensor design like Sony's)?! Since it isn't April 1st, can anyone please enlighten me or share a link with an explanation?
Gimmick? Let's go shoot some sports together at night, or perhaps a wedding reception of kids running around. Your advertising to the sports editor or the couple of the wedding will really be a gimmick when you have no shots to produce and I have several hundred. I owned both the 5D2 and 7D and the 5D3 is way better than those 2 combined. Hardly a gimmick. If it's a gimmick, fine, it gets me shots I couldn't get with either the 5D2 or 7D. All to their own I suppose.
On a more useful note, I doubt this camera will be released for some time. The 1DX and 5D3 are way too new.