No WWAN connection for Nexus 7?

Engadget reports that the Nexus 7 has no WWAN connectivity? Could sopmeone please tell me exactly what this means?

I understand it stands for wireless wide area network, but what does that mean for users? I am interested in picking up this tablet, but I am wondering if connecting to wifi in a larger building will be dificult? Or does WWAN refer to a network across a city or region?

Any help would be great thanks!