Read the official Contao announcements.
Contao 3.0.beta1 is available
by Leo Feyer – Announcements
Contao version 3.0.beta1 is available. Please do not use beta versions for productional websites! Download the release to check whether your website or custom extension needs adaptation.
You will find an overview of the new features in the keynote of the Contao conference 2012, which is attached to this article (see below). An overview of the changes is available on GitHub or in the Contao changelog (see the following links).