Stereoscopic 3D doesn't really have a 'use' outside looking cool. Especially considering the interface would still be a 2-d touchscreen. Right now it's best application is for games (such as found with the 3ds) and even then it is still something of a gimmick (though it's almost necessary for some games). Add to this the problem that some people cannot actually see stereoscopic 3D and it's not entirely clear what purpose it could have in a general purpose mobile device.
