Amigliora,
Yes it is true, the link was for the distro....
Generally it takes a week or so for the standard repositories to be updated, as it requires them to complete/test scripts for upgrading. I expect they will be available sooner as to the best of my knowledge, there are no major structural changes.
If you want to proceed to upgrade to the Elastix 2.3, you can do so by enabling the beta repository via the UPDATES page in Elastix GUI and then perform a yum update at the linux command line. Naturally with this step, I strongly recommend that you have a image backup or as a minimum a Freepbx backup. When you have finished, disable the beta repository (otherwise you will forget).
Naturally if you read this information 3 weeks later, then I do not recommend enabling the Beta repository. The Beta repository is not a single snapshot of the Elastix 2.3 version, it is a constantly changing repository of updates, which can include modifications/updates for Elastix 2.4, and as such may not have certain items tested (e.g. scripts that make minor upgrade changes).
So its a case of beware....make sure you have backups...or wait for them to move the 2.3 beta files to the standard repository.
Regards
Bob