Back at CES in January Sony showed off a Z1 like camera they said they were working on to handle 4K for the Prosumer market.
Here is the Sony FDR-AX1 2K 4K camera back then:
Now thanks to a Chinese source there has been an alledged leak of what that Sony FDR-AX1 4K Camcorder looks like to the guys over at sonyalpharumors.com and they dropped some of the specs it will have too.
Sony FDR-AX1 4K Camcorder 4K Camcorder Rumoured Specs:
XQD memory card
Can switch between 4K and 2k
Records in CAVC/S 4K HD
20X Optical zoom (fixed lens)
3X ND filters
Price: less than $5,000