Ala Mhigo most likely. I can also see SAM and RDM being implemented. No new races this time, I'm afraid. I feel the 3.x series will put an end to this whole Zodiark arc and then we'll get into the core of the Garlean Empire, being the main focus of the whole campaign. Maybe they'll introduce a new threat, possibly at the end of the current series or hinted during the 4.x series. That would justify why Yoshi-p decided to not make all the 2.0 and 3.0 stuff mandatory to gain access to the 4.0 content. New story arc, new adventure.