In our review of the new Bossk minifigure, we questioned if his signature rifle would be an accessory. Based on this package pic, he does have a gun; however, its simply the long blaster rifle (part 57899). It looks like we'll have to turn to custom minifig markets if we want anything more true to form with the films.
We also see that the technic pin does serve as a silencer-type attachment on the end of Boba Fett's gun. Was it too difficult to offer this up in black?!
This picture is part of a more detailed set review on Eurobricks by CopMike. Click on over and check it out when you have a chance.
(Picture from Eurobricks)