Nahat Anoj
First Post
Confirmation of no new classes in the Darksun books is given in this James Wyatt interview on Newbie DM. Scroll down to the last question.

Emphasis mine, naturally.Finally, tease us with something we can expect in 4th ed. that we don’t know yet.
I suppose this is a nice way of coming full circle from the start of the interview. You should expect the unexpected! I don’t ever want the design team to fall into ruts or do things because that’s what we’ve done before. For example, when we started Dark Sun design, we had a lot of discussions about what class we should include in the book, because we had introduced a class in each of our previous two campaign setting Player’s Guides. But first we had to ask the question of whether a new class was the right thing to add to the game in Dark Sun, and ultimately we decided no. So instead, Dark Sun is going to offer an entirely new mechanic that will take you by surprise. Stay tuned!
