User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-75.190.237.75-20120904153005/@comment-4057437-20120919175421

One doesn't need a letter from the other Jarls, just be Thane and talk the Jarl. Your new housecarl will introduce him/herself before you even buy the plot of land, LOL.