If you would like to see support for a particular feature that is not listed here please enter them in JIRA or send a mail to the mailing lists.
Continuum is using the Maven SCM library for checking out and getting updates from the SCM the project is stored in. Continuum currently only supports CVS and Subversion but support for these SCM is planned:
Currently all checkouts are done while the user presses the "add project" button which can take up to several minutes to complete. Continuum need to do this in the background and show that the prjoect currently are beeing checked out in the overview pages. For status updates on this issues take a look at the JIRA issue.