Kaehler-Ricci solitons on homogeneous toric bundles (II)
  It is proved that an homogeneous toric bundles over a flag manifold G^\C/P admits a Kaehler-Ricci solitonic metric if and only if it is Fano. In particular, an homogeneous toric bundle of this kind is Kaehler-Einstein if and only if it is Fano and its Futaki invariant vanishes identically. 
Fabio Podesta' and Andrea Spiro