We have just released Community Builder 1.8 beta 1 and CBSubs 1.3 beta 1 immedeately available for Developer members from the Developer download area. Both packages should not be installed on live websites and should only be used for testing and development staging purposes.
These builds work on all Joomla environments (Joomla 1.0.x, Joomla 1.5.x, Joomla 1.7.x) including the just released Joomla 2.5 RC1 environment. Developer members are encouraged to post feedback on both products in the Developers forum area.