The Call of Duty franchise is a massive hit on almost every platform that it launches on. However, Nintendo systems have traditionally been one of the lowest performing releases for the hit series. The last game to be featured on a Nintendo console was 2013’s Call of Duty: Ghosts with Advanced Warfare skipping the Wii U entirely. On the handheld front, Call of Duty has never debuted on the 3DS, with the last game hitting the DS in 2009 in the form of Call of Duty: Modern Warfare: Mobilized. This could be in for a change though, as one NeoGaf user pointed out that some updates to callofduty.com indicate a renewed relationship.
In the area of the site where you are able to link your account to other services, such as Xbox Live, PSN, and Steam, a new option has appeared allowing you to link to a Nintendo Network ID account. This change seems to have happened in the last few weeks, hinting at a possible new game release for a Nintendo platform. Since NNIDs are used across the Wii U and 3DS, there is no way to know which system could be getting what game. Of course, with the announcement of Call of Duty: Black Ops 3 many speculate that this is what will come to Wii U. Alternatively, Activision could be looking at a 3DS release, as that is a much more viable platform at the moment.
With Advanced Warfare skipping both systems it seems odd to dip back into the Nintendo ecosystem. Without confirmation from Activision we can only speculate though, and there seems to be something in the pipeline for Nintendo coming, at the very least.