So the new toys will likely be popular with bronies. The real questions are:
1) Will they be popular with the target demographic?
2) Will their popularity cause other retailers - they're Toys R Us exclusives - to want to snatch them up? Furthermore, is the exclusivity because other retailers merely want to see a test market because they're skittish, or did Hasbro only seek to sell to Toys R Us, and didn't even bother to talk to Wal-Mart and others about this?
Most "exclusives" are done for two reasons:
1. A special deal by a specific store, essentially paying EXTRA to have the deal (like my overloards at Targét did with the "Canterlot Collection").
or
2. The toy maker chose a specific place to target a limited sales demographic. Hasbro is most likely in this case skittish and doing their own "testing."
Matell, for instance, has a longstanding relationship with a small but devoted group of He-Man fans. To this day, at conventions and through their much more well-organized on-line store, they do they limited releases of Masters of the Universe and She-Ra figures.
This is based on my experience being friends with two VERY big toy collectors. One of them literally has two rooms with nothing but his toys, and took a second job just so he could pay for more toys.