User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-4976111-20120831015949/@comment-2098589-20120907203938

i actually think they called it hearthfire just to make us speculate,

i think i was first to suggest nocturnals summoning date(i think, i cant be certain)

and all the others suggesting the holidays in hearthfire.