World of Warcraft: Cataclysm Beta Client Updated to Include Background Streaming
Shacknews has asked Blizzard for clarification on what this means for the end-user, though it sounds like it will let Blizzard stream changes and minor patches in the background, reducing the frequency of patches.
It does not sound like it will replace the patching process and it remains to be seen if it will change the weekly downtime during maintenance. In any case, if you're in the beta, uninstall your client and download the new version through the Battle.net account management page. You cannot patch up to this version.
From The Chatty
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Are -people who dont have active WOW accounts getting invited to Cataclysm if they opted in?