So i did a little researching using primarily this old leakhttp://www.torhead.com/guide/leaks
and came up with this: other than the Makeb there will 2 lvl 55 daily planets, 2 lvl 55 operations, and 2 lvl 55 flashpoints.
Scum and Villainy - The hutts are builiding an army on Varl, and have to be stopped.
The Dread Masters - They are at last confronted and it may be presumable the Hutts were hired by them somewhat.
Titans of Industry: Czerka technology similar to HK is being dealt with here most likely.
The Imperial Warlord: Imperial Moff Regus has gone rouge.
Level 55 Daily Planets:
Also, with the new Lehon planet coming in (end of KOTOR) with the new operation "The Dread Masters" it raises an important lore question. Are The Dread Masters themselves who were meant to be protective Sith Lords in fact Rakata? Was Soa related somehow to them? Post your comments about what you think about this stuff being in-game and this iffy lore question.