The Final Fantasy is an old franchise as well as its job system. Veteran FF players know the jobs and system since they have been left intact since basically forever. The system changes, but the core iconic classes have always been left alone. Since this thread is focused on the two of three basic icon mages of the FF franchise, I'll focus on them.
In every FF the white mage is a divine healer. It has been give non-spell abilities like pray and martyr, plus spells like the defining attack spell holy. The white mage is even classified as a priest in a few games, like FFT. So when I say the white mage is a holy, divine, or godly, this should come to no shock.
In every FF the black mage is an elemental offensive mage. It had a few "dark" spells and drains, but is not true for every FF. The elemental nukes are the only consistent unchanging spell they get. The tie to the elements even shows up in many FF with abilities they get like geomancy and elemental seal. So it is no far stretch to say they are elemental based.
Why do I bring this up?
This is a final fantasy game, a long running franchise, that has ionic classes that have helped define it since forever. I fail to see SE changing their ways for this game.
Now lets look at a well-known and recently remade FF game that is known for its job system. I use this FF due to the fact that I've heard many people make comparisons and it has a job requirement system. I'm not saying this game will copy it, but SE is not going to be changing core elements of the job system.
Final Fantasy Tactics
White mage is called a priest and has the description...
"The Priest controls holy magic by borrowing soul power. Often uses recuperative and support magic, 'White Magic"
or the newer version
"A warrior who taps into the powers of the divine, using White Magicks to cast spells of recovery and protection."
Black mage is called wizard and has the description...
"The Wizard controls the elements which make up this world. Often uses attack magic, 'Black Magic.:
or the newer version
"A warrior who uses Black Magicks to channel elemental powers into powerful offensive spells"
Now let look at the job tree real quick. (not the full tree)
Chemist--> Priest --> Oracle/Mystic --> Mediator
Chemist --> Wizard --> Time Mage --> Summoner
Oracle is "The Oracle has control over elements of life itself, through the manipulation of Yin and Yang"
Summoner is "The Summoner who can call illusionary monsters, spirits of the highest rank. Uses 'Summon Magic', a special contract with the spirits."
Wait, a divine path and an elemental path?
SE is not going to change the core elements of the job system or of their iconic White and Black mages. They have been around since FF1. The white mage is not going to become elemental, suddenly, nor is the black mage going divine. The point of playing FF14 is to play a FF online. Not another game. In FF the White Mage is divine and Black Mage is elemental.
I fail to see how conjurers, aka elemenalists, aka druids, (yes, they are called that if you look at what they are called in the other languages: ie. Deutsches = Druide and Français = Élémentaliste) are generous healers? The conjurer quests are all about appeasing the elements that are fickle and kill EVERYTHING that annoys them in the forest. All of Gridinia, that is lead by the elemental appeasing conjures, is isolationist and xenophobic for fear of elementals being angered. All the quests for the guilds in Gradinia, lancer and archer, involve the conjures and keeping elements happy. This means healers?
THM are holy and are described "within whose hallowed walls are said to reside powers of life, death, and the beyond."
The main Ul'dah story quests has people trying to convince the THM to resurrect someone. If that isn't divine healing, what is?
The DEV team has already put out a list of jobs in that interview (previously posted). They would be stupid to put jobs out that are not coming out anytime soon. Build community hype about jobs and then say sorry, those were for next year.
I have provided a lot of time and research on this thread, take what you will. In the end, Conjurer is still elemental and THM is still divine. The white mage has always been holy in the past FF games and the black mage elemental. If SE changes that tradition, I'll be very surprised.