Sony was
reported to have a full-frame (presumably 35mm) curved sensor camera ready to announce last December, but Christmas seems to be late there. Nikon was
reported to have a curved-sensor compact in the works a few months ago, but we're still waiting on that, too.
Apple apparently has a patent on a curved sensor, too - Sony's is for a flat-formed sensor fixed to a dished ceramic backing, so I'm not sure what Apple's patent does differently.
It seems to be the next big thing, although that was also going to be Lytro, once, I recall. When Sony announced its patent in 2014, I recall some of our members using that to beat Ricoh around the head for not being innovative, because that was going to be the next big thing. Maybe it will be, but we're still waiting...