Plesk Sitebuilder 4.2 was released almost 3 weeks ago. You can check details here: http://www.parallels.com/en/products/sitebuilder. As for autoupdate feature new version should not be accessible there, as autoupdate works now only in the context of one version. Only available hotfixes can be installed with it, but not new version. Here is some info from documentation:
Plesk Sitebuilder allows you to install product updates issued by Parallels directly from your Administrator Panel. The updates include fixes for known Plesk Sitebuilder issues (if any), and enhancements to features included in the installed Plesk Sitebuilder version.
Plesk Sitebuilder automatically connects to the Parallels server once a day and retrieves the available updates. The latest retrieved update is shown on the Autoupdate page (Server Server > Autoupdate icon Autoupdate).
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