Photoshop CC2014 is the newest version of Photoshop. You got it as part of your subscription when Photoshop CC became obsolete. It's the automatic upgrade you were promised as part of the subscription. There will be many more like this until you die or end your subscription,
Many users prefer to keep older versions around, e.g. until they are sure they won't need them.
For example, the Oil Paint Filter has been removed from CC2014, If you use it, you need to keep CC as well as CC2014.