The latest rumor from the rumor mill is that Sony is working on an Android smartphone with a 20-megapixel sensor capable of recording 4K video. This would allow the smartphone to record video for the latest 4K Ultra HD TVs and put Sony a step ahead of the other Android smartphone brands.
The rumored device is said to make use of Qualcomm's Snapdragon 800 CPU, which is said to be powerful enough to handle stereoscopic 3D video, 4K video, or up to 55-megapixel cameras. Sony is also said to be planning on applying their own UI to Android to further set their Android device apart from the massess.
It's not clear how much the device will cost, though we imagine it won't be cheap. Current 4K video cameras are quite expensive, and so are current 4K TVs and monitors. 4K resolution is the next step in high definition, but it's currently in its fledgling state. Ultra HD Blu-rays aren't coming out until next year and Sony has a 4K streaming service scheduled to launch this summer.
As with all rumors, take this with a grain of salt. With that said, a 4K camera in a smartphone would be quite impressive.