From MaRo's Blogatog:
Oath of the Gatewatch will have full art basic lands. They will be the same full art lands from Battle for Zendikar (complete with expansion symbol). The Oath of the Gatewatch fat packs will also have full art basic lands. The Battle for Zendikar gift box, by the way, will not have full art basic lands (except, of course, for inside booster packs).
Given the limited print run of Battle for Zendikar fat packs, I'd imagine that Oath of the Gatewatch fat packs will be in limited supply as well. This is unfortunate for those who like to acquire fat packs to have them, but the silver lining is that, even with a limited run on both fat packs, this does put a lot of full art lands into circulation. Hopefully your LGS is good about how they handle the supply that they get.