Given everything I've heard so far, the Puppet Master, Beast Master, or Geomancer may be next. I never played FFXI so I'm no expert, but I think the Beast Master may be the class most likely to be limited. Unless SE homogenized the beasts, balancing content with the different beasts in mind would be a massive hassle. The Puppet Master would be like the Summoner, but with most of your skills coming from the puppet. Although, I've heard the Puppet Master also knew hand-to-hand in FFXI. As such, I think it's got a good chance of being a full job, unless the puppet is a hybrid (DPS, Tank, and Healer)

Geomancer seems like a nuisance too given it's skills are dependent on terrain. Not only would SE have to program different spells based on what floor you're standing on (or your current zone, which would be far more limiting), but the Geomancer is known for applying status ailments to the enemy, at least in FFT. Due to diminishing returns on status duration, the effectiveness of the class would fall off quickly, unless they nix the status part.

Personally, as stated in the thread I started, I'm hoping to one day see the Onion Knight, but I know that's not going to happen anytime soon, if at all.