Slashdot Talks with David Nalley About Apache CloudStack (Video)
This Citrix Web page at buildacloud.org says, "David is a PMC (Project Management Commitee) member of the Apache CloudStack project, jClouds committer, Fedora contributor and an Open Source Evangelist for the Open Source Business Office at Citrix." CloudStack has been an Apache Top Level Project since March 2013, with David on board all the way. He's obviously the right person to turn to for an Apache CloudStack update, including some commentary on the differences between Apache CloudStack and OpenStack, two projects often viewed as competitors. (Alternate Video Link)
CloudStack is open source, owned by the ASF, and you can totally host it yourself and make any changes you need.
Citrix has their Citrix CloudPlatform product based on the Apache CloudStack (ACS) source code, IBM might have their own product based on ACS (or SoftLayer), but at the end of the day, neither IBM's product or Citrix's product is ACS as neither company owns or controls the Apache Foundation.