My guess is Turbine either didn't make this a priority,
Is waiting for the missing regions of Rhovanion to fill in first. i.e. Anorien, North Mirkwood, Dagorlad, Gladden Fields, Wilderland, Rhun, maybe even Erebor. No sense releasing a map deed for regions that aren't even in the game yet.
LvL 100s: Beorning, Burglar, Captain, Champ, Guardian, Hunter, Lore-Master, Minstrel, Rune-Keeper
LvL 85: Warden, Minstrel
All my forum posts are my opinions and may not even be that. Also On Twitter: @leixicon