Oracle doesn’t seem interested in clarifying what will happen to its hypervisor in the near future, or how it will integrate with the virtualization technologies acquired by Sun and Virtual Iron.
The only thing we know for sure is that the merge is going to be painful for somebody.
In a way or another Oracle believes that its current customers will continue to upgrade their existing Oracle VM implementation instead of freezing any activity before the strategy is clear, and so it releases a minor update.
Oracle VM 2.1.5 is mainly for bugfixes but it also introduces a brand new Command Line Interface (CLI) (soon to be released through the Unbreakable Linux Network update site) and a Web Services API, both for Oracle VM Manager.