According to Times Online, the PlayStation Home open beta will hit on December 17th. From an article published yesterday:
To try Home, which is slated for release in the next 10 days, players must download a piece of free software from Sony’s PlayStation store onto their own PS3.
Just keep in mind that even if Times Online has the scoop, they're a UK publication who may not be speaking for a worldwide release date.
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Then again, December 17th up with Sony's own assurances quite nicely...even if it's all a bit too late for pre-Christmas hype. [Times Online via Kotaku]