Jacobs and WAR community coordinator James Nichols have been on the front lines of this discussion. Jacobs in particular has offered up two lengthy posts on the issue, providing Mythic's viewpoint on both the classes and cities pulled. On the class front, it sounds as though these offerings simply weren't coming together from a design perspective. Jacobs even goes so far as to say that new classes may be put in their place if they can't 'get them right' post-launch. The pulled cities, on the other hand, will probably be added to the game at a later date. For now, the team wanted to focus the energy of the players and the developers into two red-hot points. There's a ton of perspective on this issue in the forum posts - make sure to check them out.