We will announce in the forums, and on our Facebook and twitter pages when updates are released.
we hope to have an update for Data Bridge this week, and will then do the others one at a time.
yes, the extensions will still work in DW CC.
see this adobe boo post for details on installing previous versions:
http://blogs.adobe.com/kevinmonahan/2014/01/29/revert-to-a-previous-version-of-premiere-pro-cc-or-any-creative-cloud-application/