Ah! You're right! How could I forget about hot for teacher?
There's nothing released about multiclassing yet, because it's currently going through some revision in light of the recent decision to make job-changing on the fly possible. Tentatively, it's this:
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SWITCHING JOBS
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Job advancement and character advancement are seperate forces. A character advances according to the "BASE" class, and can have a number of job levels equal to their "BASE" level, assigned in whatever jobs they choose to assign their levels to.
For instane, a character of level 5 ("BASE 5") can have 5 levels split between as many jobs as he has access to. In all situations, however, only the current highest statistic applies -- they do not add together. This means that if they split those 5 levels between 5 different jobs, it is entirely likely that they have may not have an ATK score greater than 1. Thus, there is a rule of diminishing returns on taking multiple jobs -- you gain more abilities, and more versatility, but you will loose on raw power.
It is also impossible to increase a job level beyond the job level you have access to. That level 5 character above may not have any one job pushed beyond level 3, meaning even if he selects his level 3 job, he could select up to two others at level 1 (or one other at level 2). At all times, a character can only have one Primary Job, a job that they apply JP to increasing the job level of. All others are considered sub-jobs.
Jobs can be easily switched at any Camp location, simply by choosing to do so. You can also willfully reduce your level in a job. After conducting a job change, you will be handicapped for a time, spending 1 day with negative levels equal to your base level.
In all cases, you do gain access to the job abilities of the job levels you possess (and you loose access if you reduce those job levels below the minimum level the job gains those abilities at).
EXAMPLE:
Erika is a 10th-level character with access to the Soldier, Black Mage, White Mage, and Thief jobs. She has 10 job levels in Thief, 5 in Black Mage, 1 in Soldier, and 3 in White Mage. She can mix and match her 10 levels between any of these, gaining the appropriate powers for her total job levels. If she has puts 9 job levels in Thief and 1 job level in Soldier, she has access to all Thievery and Technique abilities of a 9th-level thief and a 1st-level Soldier. She also gains the higher of the jobs' hit points, magic points, ATK score, DEF score, VIT score, etc, depending upon which is higher. In this instance, she would have the thief's base HP (27), MP (23), ATK score (3), DEF score (2), VIT score (0), MAG score (2), MND score (2) and AGI score (4), and the soldier's base DMG rating (1d10). She would have access to 9th level Thievery abilities (Steal Gil, Escape, Unlock, Secret Passages, and Steal Item) and 1st level Technique abilities (Advance). She will suffer 10 Negative Levels for 1 day as she gets used to her new job.
Erika also needs to choose a primary job, a job that her earned JP will go to increasing. She selects Soldier. This gives her the Bonuses for the job levels she has in soldier (none, yet). She would get Bonuses if she selected Thief as her main job, but she cannot raise the level of her Thief job anymore until she gains more Base levels. She also gains the skill training and proficiencies of her new job. As it sits, Erika is basically a thief, but she deals more damage with a wider variety of weapons. She isn't quite as skilled as most theives, but that's probably because she's now training in heavier armor. She also can perofrm the Advance technique, gaining an edge to damage at the expense of her safety.
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Also, here's the Soldier!