Hopefully he's finished off the Sword of Air and has reaquired the rights to publish Tengel Manor.
outside of that I can't see what unique elements he'd be bringing to Pathfinder that isn't already filled out by numerous other third party members years after their official partnership (2007?) started.
Personally, I hope he publishes a whole new campaign setting, fully supported with adventures and supps that nearly rival Paizo's Pathfinder's default Golarion setting.