Responding to a comment about not adding prestiges after launch on Reddit, David Vonderhaar has stated that the team at Treyarch ‘are not fans of adding Prestige Levels after launch.’

Hi, We are not fans of adding Prestige Levels after launch. We wanted Prestige to have an end goal and off ramp. It’s why we gave it a name (Master Prestige) and removed the level icon when you hit it. We do think there is a room to do interesting things to highlight a Master Prestige player that keeps playing that is NOT adding more prestige levels. It’s designed, but not implemented yet, and I don’t want to put my foot in my mouth in case it doesn’t happen for scope or schedule reasons. -V

This is in contrast to Sledgehammer Games; they launched Call of Duty: Advanced Warfare with 15 prestiges and in March, added 15 additional prestiges called “Grand Master Prestiges.” With Infinity Ward, for their older release, Modern Warfare 3, they added 10 additional prestiges after that title’s launch. They did not add more prestiges to Call of Duty: Ghosts, however.

Treyarch has not yet announced the final number of prestiges that will be in Call of Duty: Black Ops 3.

SOURCE: Reddit via CoDOnlineBlog