I've seen this a few times and I wonder if the dev's for 4e were too timid when they made 4e. They knew, or at least had to have a pretty good idea, that when 4e hit it would make loads of waves. I almost have an impression that they were constrained because they were producing the very basic structure for the rest of the game. They couldn't go too far into "cool" because it would screw up too many things later down the line. Later supplements seem to be building off of that baseline, allowing the dev's to branch out much further than in the initial books.
Just a thought.
You might want to visit this link, Hussar: mearls: Player's Handbook 2
Me, I'm happy with what I have so far, and I'm looking forward to the 2009 products - they look fun.

Cheers!