I went to my local electronic supply store to buy a new Arduino. The store was out of Arduinos and they told me that they would be allowed to place orders for the new Arduino board starting Sept. 14, delivery expected a week or so after that. So it looks like I will need to wait a few weeks before I can connect up an Arduino to my Dynamixel AX-12s. It would be cool if they upgraded the Arduino to the same processor as the CM-510 which is the ATMega 2561. The picture on the Arduino website supports what I was told! The caption for the picture is mysteryDuino!
Looks like I was right! Follow this link to pictures I took at the New York Makers Faire of the new Arduino Uno and Mega.
Link to the Arduino website.