I think reality suggests that it was probably designed for malicious purposes
regardless of these statements. Separating the processes in such a way that
it is actively hiding third party access from the user and making it
difficult to detect is highly concerning. Just because it alerts users under
legitimate use that a third party is accessing the system doesn't mean it
can't be used by governments or others maliciously. It is specifically
designed such that it can be used surreptitiously- regardless of the
implementation of the technology at this time. It's not going to tell you
when the government accesses your system even if it alerts you with a red
boarder when it's being used with your authorization by a commercial entity.
This 'secret' feature is hiding in plain sight and we don't know enough about
how it works under the hood. What we think we know is what Intel's telling
us. We need details about the CPUs and cooperation from Intel on developing a
free software friendly BIOS.
There have been past issues with Intel and privacy. I see no reason to trust
Intel.
See here:
http://en.wikipedia.org/wiki/Pentium_III#Controversy_about_privacy_issues