Treyarch announce Black Ops 3 modding but only on PC due in 2016. On Treyarch’s blog they said “We’ve been listening to one of your top requests and are excited to announce that modding and mapping are coming to Call of Duty: Black Ops 3 PC!”
This looks very interesting and promising as it gives the game more opportunities. Treyarch’s plan is to allow you to create game modes and maps, server files with tools so you can run your own server with modded content, server browser so you can easily find and join modded servers. They have said some of these features might slip or drop off or be replaced with other “more awesome” features. Treyarch are hoping for an open beta for the modding feature in March 2016. In all I think this would be an awesome feature for Call of Duty as it has been done before but as an add on for Call of Duty Modern Warfare.