Per http://support.amd.com/us/kbarticles...st126beta.aspx:

With the release of the AMD Catalyst™ 12.6 Beta driver (“Catalyst”), AMD
would also like to announce that we are moving away from our Monthly Catalyst
release plan. Our goal is to ensure that every Catalyst release delivers a
substantial benefit to our end users; as we have today with the release of the
Catalyst 12.6a Beta. We will still continue with the Catalyst naming convention;
Catalyst: Year.Month. You just won’t see a new driver every single month. We
are confident that this will only benefit the end user; you’ll only need to
upgrade to a new Catalyst driver, when it makes sense.
Finally! I was really getting tired of downloading 100+ MB every month just because they felt the need to release a new version every month whether or not there was a benefit just so I could see if the new version breaks the Collatz apps or not.