There will be no single player story mode for Call of Duty: Black Ops 3 on either the Xbox 360 or PlayStation 3. All you will get is the competitive multiplayer and the Zombies mode. That is it.
As we announced back in June, we know that there are still fans waiting to make the switch to the newest console hardware and developers Beenox and Mercenary Technology have been working tirelessly to bring as much of the Black Ops 3 gameplay as possible to the PlayStation 3 and Xbox 360.

The Black Ops 3 PS3 and Xbox 360 versions will feature Multiplayer and Zombies gameplay only, not Campaign. The ambitious scope of the 1-4 player coop Campaign design of the PS4, Xbox One and PC versions could not be faithfully recreated on old generation hardware.

Oh, so maybe the price will be drastically reduced, right? How does ten sweet dollars off sound to you? What, it's not enough? Too bad, because that's all the cheaper it's going to be!

Yes, despite not having an entire, major game mode, the game will still run previous-gen console owners $50 (USD). I often said that it would be a smart idea to sell the two components (SP and MP) separately for those that only wanted one, but I never thought the idea would end up mangled this badly.

(via Call of Duty)