It was explained to me that they weren't supported because the virtual keyboard won't show up on the pre-boot screen. All of our tablet users, use the physical keyboard to log in, so this isn't a problem for us. I have a bunch of tablet's encrypted with EEPC601 and I haven't come across any major issues.
Thanks for the information. I really thought that this would be the case but I just wanted to confirm with others that EEPC 6.0.1 works with Windows XP Tablet 2005.