I was more refering to the Wu-Jen or Worlock, or other new core class that has a totally different spell list usually made up of spells that are primarilly from the new book. A player in my group recently brought to my attention a new class he purchased a online PDF for called a crystalmancer. The class had about 60 pages of new spells, all based on crystals or gems. Did I immediately say no so I could avoid the reading, not on your life, the class sounded interesting and I allowed it because it brought a new idea to the group. This is the kind of thing I am talking about.