[ubuntu] Difference Precise Alpha and Precise Beta installation

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http://ubuntuforums.org – I have installed Ubuntu Precise Pangolin Alpha release (Daily build dated 20-Feb-2012) and have been upgrading it regularly since then. Now I can see that beta release is available. So I just want to know what is the difference between Alpha release with regular updates and the new beta release. TO have beta release on my computer, do I have to download and re-install? Same/similar question holds for beta and final? When the final release will be available, do I need to install? Or just a regular update/upgrade will take care of it? Thanks in advance -- VInay (Hardware)