This is apparantly already decided, according to this October 7th IRC message:
< ixix> Ed, me, Mike, none of us want old SD
Probably some misunderstanding, as I surely want a fullsized SD slot and Michael wants one if we have the space for it (which is something that needs to be checked).
EDIT: Just found an eMail Craig sent me a few hours ago where he asked whether we're set with MicroSD or not. Not sure about Mike (the above is the latest info from him), but I'm pretty sure I want full sized SD if possible (don't want to throw away my 128GB Card... and that size is not even possible yet with MicroSDXC)
Good to know that microSD-only is not yet a final decision. We shouldn't derail this thread with that discussion, but I think there's a broad consensus in the community that at least one full SD slot is absolutely desired (and many are even in favor of two full SD slots). If space is the issue, then make the thing bigger