Apple probably sent them the outer schematics so they could design stuff around it. Stuff like this would take 4 Months + of R&D before they got anything close to this and the leaks are not enough for a multi-million dollar product line. They all probably had NDA's they had to sign and that's good enough since Belkin's business is made on accessories. If they break one NDA, their business tanks cuz people wont' trust them anymore.
In any case, Belkin Grip Vue here I come!