Nope, the purpose of the Job is to excel at one role, at the cost of not being able to utilize abilities from other classes. So what abilities are provided by the CLASS and the JOB is all you get.
Your Job can use whatever your Class can use. So a PLD can equip anything a GLA can for example.[*]Will we be able to equip gear that belongs to the class that unlocks the job upon switching to said job? The weapon? I ask because it would be a curious case if suddenly I could make Ifrit's Bow into a harp. Perhaps the BRD, in this example, uses a horn when not equipped with a transforming bow?
I can't confirm that, but I am doubting it. I believe JSE will most likely be in the rare/ex. department.[*]Will crafters be able to make job-specific gear? or will any and all job-specific gear be obtained only through content as rare loot?
I do recall them saying that AF gear will help boost the performance of your job, so maybe.[*]Will there be set bonuses for equipping the entire set of job-specific gear? For that matter, will there be other sets - not only job-specific - that will be released in the future that will grant set bonuses? Existent sets perhaps receiving set bonuses?
My guess stat wise is that they will be as good as 2-slot materia, could be wrong however. They want crafted gear to ultimately be better, but you have to get a lot slotted in the piece of gear to make it the best. At least that is what they are aiming for.[*]It was said that the disclosed job-specific gear sets will be unlocked upon completing all the quests for that job, and that these items will be Unique/Untradeable. What sort of potency can we expect in their stats? Will they be about equivalent to triple-melded crafted items like the current Ifrit and Moogle weapons? Will they have unique bonuses not attainable via materia that will benefit the job in question? What sort of motivation is there, besides appearance, to equip job-specific gear instead of class gear, should class gear be accessible?
There will be a system in which the development name is "Job Stones" that will be on your menu and you apparently simply activate the job on the class you are on. It could of changed however, but that is how it was explained in interviews.[*]What will be the process of switching to and from a job? Will it be through the use of an inventory item, a key item, a menu selection, or perhaps through equipping a job-specific weapon?
Your point allocations only derive from your class. This is another guess, but I believe certain stats will be automatically enhanced when switching to a certain job. Like switching from GLA to PLD will greatly increase your defense, or switching from LNC to DRG will increase your Crit+ rating.[*]When on a job will a players attribute build be different from that of the class the job stems from? Will jobs have their own point allocation?