Each of the four issues in this series has a hidden message somewhere in the story that can only be seen using the special decoder that came packaged with issue #4.
The hidden message in this issue reads: "Scorpio is the illegitimate son of Nick Fury and his brother's wife Amber D'Alexis".
Once all four hidden messages had been decoded, you could enter the 30th Anniversay S.H.I.E.L.D. Encryption Contest, with prizes including original art and comics signed by the creative team.