Gizmodo has some photos up of a special edition Halo 3 themed Zune . I saw one this morning - it's a classic black zune with some Halo 3 themed elements printed on it. Loaded on the device is some Halo 3 content. I'll see if I can dig up some...
Bungie have announced that the Halo 3 Beta starts on May 16th. It's going to be fun.