The new future shock 2.0 uses the same clamp and internal diameter as the old 1.0. Both are full sealed systems and the 2.0 is supposed to be longer. There is a possibility that it will not work on small frames, but my 61cm has several inches of extra room.

The main reason that specialized doesn't want to sell these IMO is that they are simply not making enough of them to meet demand for production of current bikes that use them. Give them a year and suddenly they will have enough and retrofits will be easily available.