Character classes:

from the player's handbook, we'll be retaining the Barbarian, Fighter, Paladin (modified), Ranger (modified), and Rogue.

We'll also add the Psion, Wilder, and possibly the Psychic Warrior from the Expanded Psionics Handbook, and the Divine Mind from Complete Psionic.

We'll include the Scout from Complete Adventurer. I expect to include the Knight from the Player's Handbook II.

the Artificer from the Eberron Campaign Setting may or may not be included, but if so it will be heavily modified. There will be some equivalent for this role if the Artificer class is not used.

lastly, there is a possibility of the Noble class (from Dragonlance and/or Star Wars, NOT the NPC class) being revised for the setting.

Oh, silly me... we'll also be including the Incarnate and Soulborn from Magic of Incarnum.