because they are hard at work on developing new single player content for an MMO. Also, their senior raid designer was transferred to another unit of the company outside of SWTOR. If I had to venture a guess I would say there won't be any new PvE group content until at least 3Q or 4Q of 2016.
Dude I feel your pain my raid teams have all but left on both factions, for WoW and other games.