By which I mean the roster of classes available to you when you're new to the game. Hypothetically speaking, they would be starting from level 1, with the only requirement being that you own the respective expansion.
I'd never really given this much thought, since I've always been at cap when an expansion drops and have met the requirements, but I recently ran into a situation in which I convinced a friend of mine to get the game. Something that influenced his decision was the idea of playing the samurai job. He's still going to play, but was bummed with the prospect of having to level til 50 to unlock something he would've liked to play from the get-go.
Not that leveling to 50 takes a long time, of course, what with the changes to experience distribution to the 2.X content, but it'd be nice to have these options available to the newbies.