I JUST read something somewhere (which if I can find it, I'll edit in the link) in which Yoshi stated that they would eventually like to include a Scout class that would branch off into Thief and in that same article, he also mentioned that they are talking about a possibility of Ninja and Samurai as he said they appear to be the most popular request from North American players.

Personally, I would love to see this Scout class mix with a PUG to create a Dancer. When DNC was announced in FFXI, I laughed. Then I tried it. 75 levels later, I was in love with it and it was one of the main reasons I went back to do the new caps. If it weren't for the fact that the game itself is a ghost town unless you want to do lame Abyssea crap, I'd go back just to bide my time until release. The downside to coming in from 1.0 is waiting :/ All you EA people are the envy of my life atm, so enjoy and I'll see you all Tuesday