RTM release now issued following the issue of GP2013 SP 1.
Its 64 Bit only and supported on Windows Server 2008 SP2 and 2oo8 R2 SP1 + Sharepoint Server and Foundation 2010. (BP 6.1 will be supported on SharePoint 2013 when its released).
Not supported on Windows Server 2012 because Sharepoint is not currently supported – wait for Sharepoint SP2.
Upgrade paths direct to 6 from BP version 4 SP2. Moving from 4 and 5 will require upgrading SharePoint to 2010…first! If you’re dropping any Business Portal applications – uninstall them before upgrading. The sequence is:
….Upgrade to Sharepoint 2010, upgrade to GP 2013, upgrade web services if in use, finally upgrade business portal.