The simple fact is the only announcement about a CD in May on centos-annouce was the LIVECD by Johnny. You can see for yourself that there is no SERVER CD newer than the December 2005 one at http://mirror.stanford.edu/yum/pub/centos/4.3/isos/i386/
Since when do things available for testing get sent to the -announce list?
Testing stuff gets announced in the development list. Perhaps you should look there, and/or update your copy of the centos guidelines.