While this is a very good concept, I can't see it being terribly succesful from a collector's standpoint, if only for the fact that the vehicles are expensive and those of us who already have the vehicles, in more cases than not, only want/need one of them. At the very least though, the Clone looks to be the #6 version with no obvious differences, so it's not like there is anything really "exclusive" about it aside from the packaging.
That being said, it would have been nice had the ARC-170 included 3 Clone Pilots and a generic astromech; the Obi-Wan and Anakin starfighters could have included pack-in pilots for each; and the BARC Speeder could have included a Biker Sco...oh, it had one? I thought that was an old Applause PVC that someone tossed in my box by mistake.
And distribution sucks because distribution has always sucked. Hasbro's had 10 years to figure out distribution and case pack ratios and they haven't gotten any better at it in that time. Just look at future case assortments and you'll see that many of the first 12 that aren't Vader are still being mixed in and I think we're going to have one hell of a summer ahead of us.
Somehow I don't think that the #7 R2-D2 is going to be in a whole lot of demand by the time the Mustafar Sound version comes out later this summer (or, by the rate things are going, next weekend).