So, yesterday I've installed Minecraft 1.6 "Horse Update". I tamed my first horse and now I'd like to obtain a horse armor. I've read Horse Armor is spawned only in treasure chests.
Around my home there's a bunch of dungeons I still need to explore, and they surely contain some treasure chests. I've got most of the surface above them explored though.
I'm fairly sure I can't expect the armor to appear in chests I have looted already. Now what about the rest? Did the chests under the chunks I have explored spawn already, with predetermined (pre-update) content? If I go exploring some new chunks, will their chests spawn the armor, or will they contain the old loot as pre-determined by the world seed when generating the world on startup?