Hopefully they release more info on it soon. I am curious to see which ones we will have, and which will not be around. Personally, I don't see us having Dragoon returning, since I don't see how it would play any differently then the lancer currently
You could have a dragon pet again, but I don't think we'll get any pet classes/jobs in the near future.
I miss my Bst...and Brd...and Dnc...
Jobs are supposed to be specialized "classes" that focus on certain aspects and have special skills/spells/abilities.
My guess is we'll get some of the standard jobs used in FFXI and other FF games:
White Mage (CON)
Black Mage (THM)
Red Mage (CON+THM)
Paladin/Mystic Knight (GLA+CON)
Dark Knight (GLA+MRD)
or something like that...