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ZDNet has the details. http://news.zdnet.com/2100-3513_22-6099857.html
[Edit] Eric Ligman also weighs in:
The Official SBS Blog : Inside SBS Podcast Episode #20 - R2 and WSUS: http://blogs.technet.com/sbs/archive/2006/07/28/443854.aspx...
When will it be re-released?