Jeff has the answer…
http://myitforum.com/cs2/blogs/jgilbert/archive/2008/07/22/upgrading-the-windows-aik-for-configuration-manager-2007-sp1.aspx
Additionally, Jeff says, “If you haven’t started the upgrade process to SP1 yet, please read this before you start. I won’t be able to get this online until R2 RTM’s so this is about the quickest heads’ up I can give you on it.”