There is one new Codex which has me as nearly excited (if not more so) than the Daemonhunters Codex and that is the Witch Hunters Codex.
Having see lots of nice preview pictures on the GW website of the new miniatures this looks like it could be another really nice release. The fact that a lot of the models are interchangeable with Daemonhunters means less models to buy.
Looking good.