To answer all things Jehenna&Farrun, in the first run of the RP they were available for RPers, however we barely managed to get enough people to fill the places for leaders of Camlorn, Evermore, Daggerfall, Northpoint and Shornhelm (in fact, we still don't have people to RP the rulers for all of those realms) so the decision was made to remove them from the map and only focus on the rest of High Rock.
The current explanation for why they are not a part, is that they were conquered by Skyrim, with the lands separating them from Evermore now belong to a liberated Reach kingdom, meaning that the places involved in the RP really do constitute the entirety of High Rock. While it would be nice to include Jehanna and Farrun, we simply don't have the people to fill them both out.