Some are from the marketplace (separate from Pro Plus) and some are community developed and some re-vamps of old themes. :)
In the past month, we've released Production (Marketplace) a new version of Focus and Agency and a new version of Prose.
Oh and Balance was new too.
These forums were CLOSED to new posts on November 19th, 2012. New forums are here: http://www.studiopress.com/forums/
and you will need to SIGN UP AGAIN.
If you need assitance with setting up your theme, go to http://my.studiopress.com/
and read the SETUP links or the TUTORIALS link on the side tab.
If you need Account Assistance
, file a help desk ticket at the same location.