Despite the contradictory statement regarding the JREF being the copyright holder of the forum, the registration agreement does not grant the JREF the right to transfer any content to a third party, nor does it grant the JREF the right to transfer personal, private information to a third party. In the privacy statement it is clearly stated that the JREF will not transfer private information without consent.
I can't consent to the transfer of my personal, private information. I'll be interested in seeing how that particular issue is expected to be resolved.
I don't care about the posts--when I post, that grants implied consent for use on the forum. It's just how it works.
Personal data and posts are two entirely different things.
JREF holds a license to reproduce your posts, per the Registration Agreement.
http://www.internationalskeptics.com/forums/showthread.php?t=45132
Private data falls under the Privacy Policy.
http://www.internationalskeptics.com/forums/faq.php?faq=new_forumprivheader_item
They are being handled separately. We've been given some explanations about how it will work.
For the posts, I think that JREF will publish your old posts in the new forum, just because it can (you gave them license to do so). In other words, the forum will work as always, but should the JREF decide to remove all old posts, they can instruct the forum owner to do so, and the forum owner should do that (not that they will, I guess - I'm just saying that the control is in their hands up to that point).
For the personal data, my understanding is that it will work with a bot that will ask you for permission, and if you grant it, it will transfer your personal data over to the new forum. That requires a server under JREF's control, permanently ready to receive transfer requests. Not sure how long that will last. My own uneducated guess is that they may pull the plug of everything at the same time (six months?), and if you haven't transferred your personal data by then, you won't be able anymore.
But these are all mostly guesses based on what has been explained here already.