This option (recommended) reduces management and servicing by installing only what is needed to run most server roles and applications. It does not include a GUIU, but you can fully manage the server locally or remotely with Windows PowerShell or other tools.
This option is useful when local admin tools are required (for example, to provide backward compatibility for an admin tool that cannot be run remotely). All server roles and features are supported.
Change password (look-and-feel) when choosing "Windows Server Technical Preview 2"
Change password when choosing "Windows Server Technical Preview 2 (with local admin tools)"
After installation run PowerShell from the command prompt. Start the following cmdlet to install the GUI and reboot the server:
Install-WindowsFeature Server-GUI-Shell -Restart
Just great to have the GUI back again (if you want it like me)! Windows Server 2016 (final name) will be released some time next year. Stay tuned for more!