The Casimir force works at the quantum level, where energy fluctuations can have a huge effect on particle attraction. In theory the new force can be scaled up to levite people, although at first it is likely to be used as a kind of non-stick coating inside circuits.
Here at the Lab, though, we're more psyched by the possiblilities of frictionless bike hubs, floating beer bottles and of course, Marty McFly's floating marvel.