Canon has created a 250-megapixel CMOS camera sensor.
During testing, the monster sensor , was able to "distinguish the lettering on the side of an airplane flying at a distance of approximately 18 km (11 mi) from the shooting location."
Canon doesn't mention it in its rather spartan press release , but the files produced by the 250MP sensor must be absolutely huge.
While this 250MP sensor won't be coming to market any time soon, it's pretty safe to assume that it will arrive in a DSLR or some other high-end imaging device eventually.
If Canon manages to squeeze out a 120MP DSLR in 2018, then maybe we'll see a 250MP camera by 2023...
Updated: Canon heard my plaintive cries and sent me some high-res images of both the camera and the sensor.