This release contains the following :
- bugfixes on both Oracle VM Manager and Oracle VM Server side
- the new webservices interface which I wrote a blog entry about, a few weeks ago
- external data-collector cronjob/thread moved into the Oracle VM Manager instance
- minor cosmetic improvements on the Oracle VM Manager side
This is a full CD release. So it is possible to do an install from scratch starting with 2.1.5, both the management and server side.
Source: Oracle VM 2.1.5 (Wim Coekaerts Blog)