I haven't seen anything about this, but if my decades old marketing knowledge is still valid, concept stores are stores that are selling not products but rather a purchasing experience. The original Disney Stores were like this, and for a while they were competing with comparable Warner Bros. Studio Stores. If you went into these stores comparing their prices to comparable products available elsewhere, you'd be disappointed. A concept store is about fostering and/or exploiting an emotional attachment, to earn higher profits than a commodity store.
The "studio" concept stores hit tough times in the late 1990s and by 2001 (before 9/11, I believe) the Warner Bros. Studio Stores were already dead. Disney held on a bit longer before selling naming rights and other transitory assets to Children's Place, effectively acknowledging that the market for studio concept stores was gone. Disney eventually regained control over Disney Stores, but have continued to operate them pretty much as commodity stores.
The consumer economy has, of course, substantially improved, so it is not surprising that Disney is considering or acting to restart the concept store approach.