There will be some kind of import whizard in ISPConfig 3. But you will not be able to install ISPConfig 3 on a server that runs ISPConfig 2, as the system configuration is completely different.
But there is no need to update as ISPConfig 2 will be developed side by side with ISPConfig 3. ISPConfig 2 is made to maintain single "root" servers based on config fiiles and system users while ISPConfig 3 is made to maintain multiple servers with a virtual user setup.
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