So far, we've heard a lot of feedback, mainly complaints, from people who are not currently using 1-series bodies, and don't seriously plan to get one. Sort of like people who say, "I was going to buy a Ferrari California, but now I'm not since they didn't put a V12 in it," and then just keep on driving their Toyota Camry, or at the most take out a 5-year loan on a newer model of the same car.
I bet many of those individuals were hoping, secretly or openly, for a camera with everything (FF, ultrahigh MP, superfast fps, excellent AF, top build) costing only slightly more than the 5DII. Or they were hoping for features in the 1-series that would obviously trickle down into lesser bodies.
But, with a few exceptions, we haven't seen much from current 1-series users. I would think those are the people to whom Canon listened when designing the 1D X. One important factor - many of them, especially 1D IV users, can add a 1D X and keep their current 1D IV for those times when they'll be limited by focal length and need the 1.3x crop and/or the ability to AF af f/8 (with one point, meaning static subjects only).
So, if you currently own/use a 1-series body, what do you think of the 1D X, and will you be getting one?