According to a post by Keith Packard on the Linux kernel mailinglist:
This module contains stuff which Intel can’t publish in source form, like Macrovision register stuff and other trade secrets. It’s optional, so if you don’t want to use a binary module, you don’t get to use code written by Intel agents for these features. And, we also haven’t figured out how and when to release this binary blob, so there’s no way you can use it today. The driver remains completely functional in the absense of the binary piece, and in fact has no reduction in functionality from previous driver releases.
So much for that idea eh?