Really have to agree with Normand on that one. One of the things that compelled me to buy Rhino was it’s laser focus on Nurbs modeling. Adding polygon and voxel tools would cloud the water and spread the development team too thin, IMO. There are already lots of programs that do those things - focus on what Rhino does best and keep making THAT better and smoother.
Having said that, maybe a push to increase interchange with other apps would be useful - like GoZ, for example. Being able to send things to and from Rhino quickly without the File->Export mouse dance would be useful.