We have no need for another Middle-Earth, DC Universe, Marvel Universe, Babylon 5, Stargate or Star Trek tabletop RPG. All of those properties really do need to lie fallow until at least 2015; I say, therefore, that what's to come will be something else entirely and thus I say that none of the speculated identities are correct.
Why, then, the excerpt from the book? I honestly believe that they're launching a new age in Middle-Earth -- either literally (4th Age) or metaphorically (a new, "revolutionary" system that fits the book better than any of the previous ones).