No, I mean no new C API at all. Anyone that wants to dynamically create a new type from C in 3.3 can already just write their own code to make the appropriate types.new_class() call:

http://docs.python.org/dev/library/types#types.new_class

A simple example, ignoring refcounting:

   types_mod = PyImport_ImportModule("types");
   new_class = PyObject_GetAttrString(types_mod, "new_class");
   new_type = PyObject_CallFunction(new_function, "s", "MyClass")

And assorted variations thereof using the different PyObject_GetAttr* and PyObject_Call* functions.