Garthanos
Arcadian Knight
However, it will not come with classes and whatnot. Its much like the RC, a description of the mechanical aspects of an FRPG, not a completely fleshed out game.
I think having a tool which meshed with it that allows input of 4e flavored data alah a character/monster/item builder would be a vital ingredient
Basically it would be necessary for a 4e clone