Well, maybe they will reprocess and create AZW3. (For gosh sakes, how hard is it? calibre coverts MOBI ==> AZW3 just fine, if you don't count the mobi7 cruft, works just as well as an AZW3 as it did as a MOBI, plus it supports the new internal file structure and can then be enhanced, edited, updated cover, etc...)
Maybe they haven't gotten to all books yet.
(This one isn't a maybe. You can still get some books as KFX, some as AZW3.)
Maybe they won't reprocess those old books at all.
...
Who knows -- why don't we wait and see.
