"Shortly after Apple announced it would be porting it's OS X operating system to Intel-based personal computers, sources told me that the selection was based on Intel's implementation of the TPM and how it could play a role in assuring Apple that bootlegged copies of its operating system would be prevented from running on just any Intel system.
This implies that TPMs will necessarily be on in this implementation. This would require some rewording of the TCG spec, or that it is TPM-bearing but not TCG compliant ...