I'd say probably beastmaster as the second limited job sometime in the 5.X patch cycle.

Next jobs in 6.0...other than guessing they'll add a healer after the backlash in 5.0, I'm not sure. It may depend in part where we go. For example if we go to the Empire next expansion, perhaps we'll get some sort of garlean tech based healer like a Doctor job or something. That could be interesting to have a tech tank, dps and healer to round things out instead of another pure magic healer.

I'm skeptical of a shapeshifting job but we'll see. They haven't even kept up with adding new egi glamours so any shapeshifted forms people may get tired of not getting new ones/updates to them, so I'm not sure this is a great idea in the long run.