Download link: https://www.microsoft.com/betaexperience/pd/SQLDCTP3CTA/enus/default.aspx

The CTP3 BOL bits are now up on MSDN: http://msdn.microsoft.com/en-us/library/ms130214(SQL.110).aspx.

The BOL restructure main page is live at: http://msdn.microsoft.com/en-us/sqlserver/hh272029.

Project Crescent overview now live at http://social.technet.microsoft.com/wiki/contents/articles/project-crescent-overview.aspx.