Sony Japan issued an official statement saying. Following the Kumamoto earthquake damage there is a supply issue that will cause a delay on the production of the following cameras:
α7
α7R
α7S
α5100
α77 II
α99
Note that the newer cameras like the second generation A7 camera series and the A63000 are not listed. It’s clear that Sony’s effort is to keep the production alive on their key products.