Well, that didn’t take very long. It seems that a third Shake Shack location that we alluded to being in the works somewhere within the greater Philadelphia metro area is indeed coming, and a lot sooner than we ever imagined. According to Foobooz, a standalone Shack is going in near the King of Prussia mall, and should have ShackBurgers sizzling on the grill by the fall. Insider adds that it will be the growing chain’s second solar powered unit. [Foobooz; Insider; Earlier]