This will not be a surprise for anyone here: I got word from a highly trusted source that the FZ-mount 4K camera prototype we saw at NABshow 2013 will definitely not be realized. 4K is going to be added on more future cameras of the E and (likely) A-mount line.
P.S.: The rumor is ranked as SR5 as this is the same source that unveiled me 1 month ago an A7 with 4K camera was in the works (I didn’t post the rumor at that time because it was a new source and I didn’t manage to double-check the rumor at that time).
Note: Also on that Interview with Sony they confirm this FZ mount 4K camera has been made only to get some feedback:
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Reminder (SR = Sonyrumor):
SR1=probably fake rumor
SR2=rumor from unknown sources
SR3=50% chance it is correct
SR4=rumor from known sources
SR5=almost certainly correct!