Infinity Ward tweeted out their annual celebration on January 1st in the form of the New Year's Card above, stating "Happy 2016! Here's to reaching new heights!". Before that, the developer Tweeted "2016 is going to be incredible. Let's do this" which sounds like the developer is working on something interesting.
Happy new year!! 2016 is going to be incredible. Let's do this.— Infinity Ward (@InfinityWard) January 1, 2016