I keep seeing the same tired tripe over and over about how 'they should wait until an expansion pack to add classes like Sam and Nin'. or 'They need to concentrate on getting 2.0 out first before they add new classes'.

Has no-one thought about the fact that 2.0, whilst being a rebuild of our current game true, is pretty much an expansion pack? and new classes being added would give folk who have a roster of 50's a new level 1 experience of the new game? New classes should most DEFINATELY be added for 2.0, i'd say two or three of them minimum.

Given what yoshi-p said in interviews, the likely 3 are,

Arcanist(class) - Summoner(job)
Musketeer(class) - unknown(job)
Scout(class) - Ninja (job)

Due to playerbase demand, a class that branches into Dark knight is likely aswell, however since nothing has been said at interviews on such aside from 'we're looking into adding two handed swords to the Gladiator class', we have nothing to go on there.