Sledgehammer Games has confirmed that the new Royalty Elite Variants and the SAC3 non-akimbo variants are set to be available only on Xbox One, PS4, and PC. They have no plans to bring these weapons to the Xbox 360 and PlayStation 3 due to hardware limitations and restrictions.
PLEASE NOTE: These Elite weapons are only available on the current generation of consoles (Xbox One and PlayStation 4) and PC. We are dedicated to providing a wide variety of content to all AW players wherever possible, but in some cases are unable to include additional content on the previous gen consoles due to hardware limitations.
SOURCE: Sledgehammer Games