Panda is an outside possibility but even then they may wait until the 2010 replacement model. And as long as there isn't a three door Bravo then I doubt there'll be an Abarth version. Uno seems the least likely candidate as it's being developed outside Europe as a car for 'expanding markets'.
Most interesting would be if FIAT give Abarth the money and the autonomy to develop a unique model (on Group underpinnings perhaps) in the style of a new Barchetta or Coupe.
Going back to the Bravo, a three-door version could look stunning, and how good would it be to see FIAT mount an assault on the WRC with a Bravo Abarth?