Parallels announced an update to Parallels Desktop 8 for Mac today that introduces experimental support for OS X Mavericks. That means developers with access to Mavericks will be able to run Parallels Desktop 8 on the OS and also install the OS X 10.9 preview in a virtual machine.
The company has an article available to walk devs through getting Desktop 8 for Mac running on Mavericks and another outlining best practices for installing it as a virtual machine. While you can’t yet install Mavericks into a blank virtual machine, you will be able to update an existing OS X install to the developer preview. Those error messages some users were getting when attempting to run Mavericks on Parallels Desktop 8 should also be taken care of with the latest build.