I don't see, where this analogy of MW:D being the Beginner Box to AToW could hold up. MW:D is a separate rule system, called the Cue System, and not a dumbed down version of AToW. Also, we can expect future products for MW:D, while the Beginner Box is a stand alone box. There won't be a Clan Invasion versions of it or something like that.
MW:D will in fact be a separate product line and it will speak to a very different audience than AToW. If an analogy needs to be drawn, MW:D will be to role-paying gamers what Alpha Strike is for miniature gamers.