From what I have seen and played of the game it looks as though the developers are attempting to change the roles classes play. What this means is that any class suggested must be able to fill multiple roles in the party, and while there should be class uniqueness it should be more in the theme of the class than the role of the class. Classes should have both a main role, but should have more variability. Also most abilities of can be used by other classes, which must be taken into account.
Anyways, some of what I would like to see as future classes.
-------------------------------------
The Massive Sword Man
Weapon: Two Handed Sword
Style: DoW
As with any character that uses a two handed sword, the first concept that comes to mind is a damage dealer. One way to give such a character diversity is to add things like Debuffing. Either way the two handed sword is a staple of any game with medieval style weapons and thus should be added.
I would give such a class abilities similar to the Astral Damage abilities of the Paladin, only with Umbral Damage. I would also give such a character Breaks such as Auron in FFX.
-------------------------------------
The Elementalist
Weapon: Unknown
Style: DoM
a portion of the game is directed at specializing in a element. The theme of the elementalist class would take element specialization a step further.
Enspells: Magical buffs that augment damage output have yet to be seen in the game. Not only could enspells further the idea of specializing in a specific element, it also provides satisfaction for those looking to play a character combining sword and sorcery. Enspells could be self-target magical buffs that are affected by the character elemental statistics.
Elemental Forms: A continuation of the idea of elemental specialization, elemental forms would have a number of benefits (and weaknesses) corresponding to a specific form. The forms could further increase the affinity for a certain element while lowering the rest. In addition, special abilities could also be added.
-------------------------------------
Other Abilities I feel should be added.
MP surge:
there is Speed and Life surge that absorb HP on hit, why not something similar that drains MP on hit. A FFXIV version of Aspir Drain.
Pets:
Pets can unbalance any game they appear in, unless of course, everyone has access to the same pet at all times. What this means is that there are a number of ways pets could be implemented in FFXIV and still keep game balance.
1. Give pets to everyone.
This can occur in a variety of ways.
One way could be implementing DRG style pets in a way similar to the companions in FFXI. this would be pets that are available to everyone, which you must go through some sort of quest to get, do not cost MP to maintain, and could have different abilities for different pets.
Another way to implement this would be to give one class the ability to summon a pet, with that single job increasing the abilities of the pet, while having normal combat abilities. Other classes would also be able to summon such a pet. This maintains the balance with the other classes that have normal combat abilities plus some sort of minor specialty. Issues with such an implementation include the possibility that everyone would then need to level the new class to even the playing field. Again, such summons would need to not rely on MP or else they will hinder DoM classes, but not so much DoW.
2. Implement pets specific to a single class, such as puppets to puppeteers and so forth. In order to maintain a balance, the character with the pet would then be nerfed so the combined master-pet could be equal to other classes. Issues with this might be a lack of abilities useable by other classes.
I personally favor the idea of questing to get pets, as that would be the easiest to implement and balance, as well as allowing for Add-Ons specific to pets, such as giving pets equipment.
-------------------------------------
Anyways, These are my ideas for some possible class concepts. If you made it through the post, congratulations.
My Final note is a suggestion for this thread. There are many concepts that are behind a single class name. It would most likely be more helpful and clear to explain the concept you would like implemented rather than simply the name.
Disclaimer: If anyone is offended by my post, I apologize, I had no intentions to do so.