When is the EOL for Photoshop CS6?
Some day in the future?! Nobody knows, but it should be obvious that CS6 is already being phased out with it no longer being available for volume licensing and education...
Actually the question should be: end of support?
It's already ended. You may get the usually 90 days for install issues, but that is all. CS6 owners are referred to the user forums.
This explains it in detail.