ATI Catalyst 10.3 Preview Edition

I read a review on ATI Catalyst driver ( @ http://www.legitreviews.com/article/1253/1
) and they mention that there is a new 10.3 Preview Edition available.

According to the review, certain applications (mainly games) really
speeds up using that new driver.

The driver is supposed to be available from
http://sites.amd.com/us/underground/...3-preview.aspx

But there is one thing that I do not understand. From the review:

"The difference between the two is that Catalyst™ 10.3a Preview will
contain future Eyefinty 6 updates and an Alien vs. Predator
optimization which the Catalyst™ 10.3 WHQL posting does not have."

What I do not understand is this --- how come the "preview version"
has optimizations but the WHQL version, which is supposed to be the
"official version", do not have those optimizations?

Why??

Penang wrote:

What I do not understand is this --- how come the "preview version"
has optimizations but the WHQL version, which is supposed to be the
"official version", do not have those optimizations?

Why??

Because those optimizations were too new to submit for WHQL testing and
will be in the next version of WHQL drivers after this release. That's
what I read at HardOCP anyway.