It's a TDY. Enjoy your time at Kirtland and expect to be delayed coming out of there... it's just the nature of the 550th. Kadena is what you make of it. It's busy as f*ck, but at the end of the day I wouldn't really say we do much. Also, you can pretty much count on getting an office job and a few additional duties right off the bat, so while you're at Kirtland I would take the time to really get into the books and learn as much as possible. The SOG just got a new commander and the new AFSOC/CC has some interesting ideas for the place, so by the time you make it out here it might actually be a good assignment.
You'll only have the schoolhouse and SERE training wise and if you have a family, they'll need to be medically cleared to travel to Kadena. There's been quite a few inbounds that never showed up as a result of their families not being good to go, so if you do have a family make sure you've at least brought the topic up to them that you might have to move to Hurlburt instead if something does go wrong so everyone isn't blindsided at the last minute.
Short of that, it's just getting on the plane and heading to Oki. Oh, if you don't have a blue passport I'd get one. There's been quite a few people that've shown up and been thrown on an off-station within a week of being cleared to fly. If you have any questions feel free to shoot me a PM.