This is not the end of reverse engineering for radeons

The AMD folks are interested in preserving DRM protections and also certain optimizations for
workstation-class hardware.

They are suppose to be providing "Tcore" software that they developed internally for driver
development and debugging purposes. It's going to be a source sanitized version, but it's
essentially what they use to do driver development internally. This is suppose to be available
somewhere, right now. But I am not sure about it. (also there is a chance that they may be
interested in a 'hybrid' model (were the open source driver and fglrx driver share code, I
expect) for driver development were they open source portions of the Fglrx driver. But they
still want to keep certain performance optimizations hidden and preserve DRM requirements so
they will never have it fully open. And the are suppose to be releasing microcode for tcore
and the one from the latest fglrx driver.)

So I figure what your talking about is being hidden to protect DRM or it's going to be
addressed with the Tcore source release, or with the microcode.