In a recent interview with focus-numerique, Sony confirmed (again) their commitment to their own A mount:
Q: Sony appears to really push the E and FE mount with a very large range of cases and optics, including the Master G range. What is the future of the mount A?
A: We have two reasons to keep the frame A. The first is that the frame A has certain advantages over the E mount and, for now, we can not have all the same functionality between the frame A and E. The second reason is that we also have a large fleet of a and optical many customers that we can not give up. It is a promise to our customers.
Maybe this is why Sony's CEO Kaz Hirai was checking out the new Nikon D5 during the CP+ show last week:
In November last year, Sony announced a new a68 camera with a plastic A mount.