It looks like Sledgehammer Games/Activision have released three new weapons and four new gear sets for Call of Duty: Advanced Warfare on Xbox One.
The new weapons include the Sten, Repulser, and the Lever Action.
Images of the new weapons, via @Incredilag:
Sledgehammer Games has added four new gear sets – Astronaut, Hunter, Racer, and Gingerbread. Michael Condrey teased the new Gingerbread gear set and a royalty variant of the Level Action weapon on Twitter:
— Michael Condrey (@MichaelCondrey) November 19, 2015
In addition, via Reddit, a picture of the Astronaut and Racer Gear Sets have been shown in the Message of the Day:
These new weapons and gear sets are acquirable through Advanced Supply Drops.