You can find many examples of 4th edition content after the fans reported back from the D&D Experience event. Besides Enworld, the most interesting thing for me were the sample characters Wizards of the Coast provided. It was fairly easy to read a character sheet and envision how that character worked. First level play looks a lot more fun and I can't wait to run Keep on the Shadowfell when it comes out in May. We had our first pre-order of KotS yesterday (highly recommended).