The actual switch is going to take place on Thursday. I'm not sure about which forums will be imported over to the new site. I believe the customizing/hack forums will go over to the new dev site. As for what software it will be running I belive they are moving everything over to OpenTopic. Instead of having to check a bunch of different forums it allows everyone to focus on one area. For support reasons it makes sense. There will be a demo board up for testing and that I should be able to do betas on as well. But again, some of this is speculation. I'm not sure on all of the details just yet.