Who said the megapixel war is over?
Sure, the headline-grabbing number on most modern-day cameras tends to be ISO. But for more specialised applications -- say, reading the serial number on an aeroplane from 17km away -- a high megapixel count is still useful.
So, to that end, Canon has made a new 250-megapixel APS-H sensor. APS-H is just a little bigger than the APS-C common in consumer DSLRs, and actually smaller than the full-frame sensors in professional cameras. In other words: fitting 250 megapixels into that space is just plain nuts.
There are some potential uses apart from long-distance plane spotting, though. 250 megapixels means that theoretically, you could crop a video 125 times, and still have Full HD footage. Of course, image quality depends on far more than just megapixel count -- but on a purely technological level at least, let's give Canon a round of applause.