Too often, a body comes out with more focus points but not more sensitive or accurate focus points. Sony and Fuji have AF points across the entire frame and they're very accurate, but they're all still so slow there's no advantage over manual focus. Nikon and Canon have been adding more and more focus points with every new model, but they're still no more accurate than they were ten years ago so you can never rely on the AF system entirely, unelss you have absolutely no other choice and have to trust to blind luck out of necessity.
It's a bizarre world where the fastest and most accurate focusing I've experienced is still the old 1Ds mkII (and the other bodies from that line) with the unassuming, cheap 100mm f/2. Even then, using anything other than the few cross-type centre points is asking for trouble. I thought the 1DX was going to finally solve my AF woes and let me be free of manual focusing for good, but nope, no dice, it may have more points but it's no more accurate and, if anything, very slightly slower.
1D X mkII bumps up the point count? Fine, if they can also bump up the sensitivity, speed and accuracy of at least the centre points. More points at the exact same performance they have now? May as well not bother, save some money.
