I have read about TAT Kastor before and was amazed to see the demo on YouTube.  The possible S60 UI is gorgeous to say the least and is exactly what Nokia phones need in my opinion (or Nvdia’s UI).  Although relatively simple looking it is a huge improvement over what is currently being used or being released.  The main reason why some of this technology isnt availbale is the compatibility with older generation phones.  But we can still try and hope that this will someday be a reality.