Adrian points to me an excerpt from Windows Server 2008 product overview:

While the Server Core installation option is a fully functioning mode
of the operating system supporting one of the designate roles, it does
not include the server graphic user interface (GUI). Because Server
Core installations include only what is required for the designated
roles, a Server Core installation will typically require less
maintenance and fewer updates as there are fewer components to manage.

I can bet remote access to manage the services will be possible via MMC, however – there will be no UI on the server or will we have a console UI similar to Linux or what ?