[boost] [any] Will it be in C++0x?

Suddenly, it occurred to me that STL does not provide an instrument for dynamic typed variables (or variants). I didn't see such a tool in TR1 either. So, are there any plans to include such a tool in C++0x? Boost.Any seems to me a very simple, yet very useful example of utility of that kind. It would be great if STL provided a similar instrument out of box.