There was one K3 update to resolve serious security issues, IIRC -- fw3.4.1 -- and absolutely no new features or standard bugfixes were included. The K3 will NOT receive updates as a matter of course, nor will any other no-longer-selling device. (Amazon typically seems to provide at most one last update to their no-longer-sold models before dropping them for good.)
Obviously Amazon ensures those devices still work with the bookstore.
