I'm not really affected by cool when it comes to smartphones. My Galaxy S with keyboard is so old and fat that no one would be interested. The Note II I've been coveting since September isn't so much fashionable as it is useful, versatile and correct.
Another thing that makes devices fashionable is their use. A lot of young users fancy themselves DJs and musicians, which is one of the reasons that MacBooks and iPads do well. I'd love to see touchscreen versions of Reaper, Sibelius and Live implemented on higher end Android tablets.