Creating classes just to fill books?

That was the first thing that pooped into my head when I read the preview for the Warden, one of the new classes coming out in the Players Handbook 2.

And how much power creep will we see? After, if you want players to buy the book, you have to give them a reason to play the classes, and from what I've read the general impression of the druid reflects this. I think the sword-mage from the Forgotten Realms Players Guide is further evidence of this... we need to make a class cool enough to buy play so let's make it tough.

I guess we'll find out in two months.