Over the years, Sony has strung along the dwindling A mount users, denying they have stopped development on the bodies and lenses. But there have been no new lenses or bodies from Sony in that mount in about five years – excepting the single piece of hardware you’d use if you were to switch to Sony E mount: the A-to-E mount adapter. Now, retailers have pulled the A mount listings.
That adapter was refreshed to a usable version just this past October, allowing stranded A mount users to employ their glass with any new Sony E mount bodies they might wish to purchase.
Still, Sony has not publicly announced the death of the mount. They appear to be having a silence contest with Canon as that firm strings along M mount users.