CB 1.2 RC has been released (June 1st, 2008) for documentation subscribers (as a token of appreciation for their on-going support).

For doc subscriber members:

CB 1.2 RC is here:
www.joomlapolis.com/component/option,com_docman/task,doc_details/gid,132/Itemid,36/

and

CB 1.2 RC Documentation is here:
www.joomlapolis.com/component/option,com_docman/task,doc_details/gid,131/Itemid,36/

Summary of CB 1.2 RC features can be found here:
www.joomlapolis.com/content/view/5474/1/

CB 1.2 RC Confirmed Issues can be found here:
www.joomlapolis.com/component/option,com_joomlaboard/Itemid,38/func,showcat/catid,51/

Plugins written for CB 1.1 are fully compatible with CB 1.2 RC but will most likely not be Joomla 1.5.X native compatible (they need to be altered to avoid Joomla 1.0.X function calls by taking advantage of extended CB 1.2 API).

The CB Team released plugins are being re-written and will be released as soon as possible (monitor this forum area for announcements).