07 Jul 2004
12 Jan 2011
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The published release date is this Friday - just 2 days away.
However, you might want to look through the forum here for details about what's NOT going to be in the initial release version. This includes, I believe, Wiki, Forums, Lists, Polls and Newsletters.
If you expect to need any of those modules, you may have to wait 'til Q1 (march) or even Q2 (July, I think).