I'm guessing the publisher is Hachette Book Group? They've pulled their stuff from Mobipocket, hopefully temporarily, because they want more country restrictions on who can buy their books or something IIRC.
It's not just Mobi books that seem to have stuff going on though. I noticed a couple of books that have been out well over a year are now (in all the big formats) all of the sudden pre-orders for upcoming months at BoB even though other sellers still offer them (these particular books were from Penguin).
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