Starting this week Parallels will be publishing weekly preview of Parallels Plesk Panel 10.4 (download).
Because it may be subject to bugs and instability issues, you shall not use it for production purposes. Upgrade from this preview version may not be supported by further production versions. Rollback isn't available. We recommend installing this software in easy-to-revert virtual environments, such as Parallels Virtuozzo Containers or any other supported virtualization software. The richest evaluation experience may be obtained if you clone one of your production Plesk servers and upgrade the clone to this (or further) preview builds. But you shouldn't attempt upgrading production Plesk servers to any of preview builds.
* Parallels Plesk Panel 10.4 for Linux
* Parallels Plesk Panel 10.4 for Windows
You'll find more detailed feature descriptions in online help (available from Plesk UI) and also following references in the Release Notes (links above)
Regular trial license can be used for software evaluation
Feedback / bugreport
Due to preview nature, it may be subject to software bugs and instability issues. Some features may be incomplete or malfunction. If you notice anything of that, please report to us via
http://www.parallels.com/support/plesk/bugreport. It also will be available right from Plesk UI.
We may not be able to respond to each problem report or deliver solution for a particular broken instance, but each report will be carefully reproduced and considered for fix in release version.
The preview will be updated weekly. You may choose to reset your virtual machine and try new installation OR try upgrade to the next preview version.