My '05 book was only good for a few months. That is likely to happen again with the '11. From the way it looks, the new Part 8 including the '11 NEC will be adopted sometime later in 2013. Then, if there are no conflicts, the 2014 will be adopted in 2014.
This happens quite a bit in Michigan. At least, once it's done, it applies to ALL electrical installations in the state. Localities can't make their own rules here any more.