User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-5144016-20120831203152/@comment-2.217.54.83-20120831205551

Hearthfire (or sometimes Heartfire) is Tameiral's version of September, and the add-on is first released on the 4th September for the Xbox 360.

Though, if it's titled by the month it's release in, then it'll be called, Frostfall, for the PC and PS3... providing if it's released on time...