My Predictions...
Time Mage as a DoT focused Magic user. Allows them to rework Smn to not be a busted balance headache because it's juggling Dots and insta cast and support with a dog-poop pet system. (Smn rework to replace Egis with some other less mobile trance and to take their dots away). Their utility could be to turn damage taken into a 5sec dot to give healers more time to through raid wide damage. Sounds kinda lame but seeing as it's not a direct DPS gain buff it could qualify as a semi-selfish DPS and warrant near BLM damage. Not a mobile job either, likes to cast spells that can use it's DoTs to build up to a massive burst phase when things time out.
Geomancer as a Melee Hammer Healer. (yup, I'm going with our girl being a hint at 2 different jobs). Being a healer I'd expect their DPS rotation to still be simple AF compared to DPS, much like Tanks, even if the devs add complexity to healer rotations as I expect they will. "But boo hoo, sometime mechs ask healers to do xyz" Then give em more dmg to make up for the fact that they have to leave the boss sometimes just like they give to melees. Also allows comps to have an easier time slotting in a melee when 3 DPS players want to play as ranged/ casters.
Tamer as "based on Beast Master buuuuut we know how sideways Blu went so yeah ..". Whip as a weapon and allows them to actually balance the ranged DPS in a good way like they did with Tnks (Dnc effectively turned Ranged into another balance nightmare cause Brd's just left without a hook and the Mch rework needs some more work as it became braindead spam that can be botted with ease if someone wants to give their fingers a break). Like Dnc it's support focused/ RDPS heavy job with AOE love. Can channel the bonds they share with certain beast to alter their attacks some and provide different buffs to the party.
Side content could be a DoL like "farm" where you can go to an instanced solo area and get eggs and wool and such from monsters you tamed. Something simple, doesn't have to me more than the instant cut scene you see when you feed your Chocobo.