Geomancer won't happen; it's explained in the 60-70 Astrologian quests that Astromancy is Geomancy. Astrologian already fills the Time Mage niche with Time Dilation, Celestial Opposition, Astral Stasis. Chemist is pretty much the only one that has any chance of happening at this juncture, IMO.
I'm pretty salty about no new healer, but hopefully they'll use the opportunity to really rework the currently existing healers. Yoshi did mention during Q&A that WHM is getting an overhaul, and it needs one pretty badly.
The concept art looks cool enough. The execution is really bad, like Roes with cat heads glued on. Textures are really really bad in the trailer.