From the Creative Cloud FAQ:
I am a Creative Cloud member using the CS6 applications included in my membership. Will I lose access to CS6 when the next full version of CS becomes available in Creative Cloud?
No, if you have downloaded and installed the CS6 versions of the applications, you will continue to have access to them without interruption as long as your membership remains active. When the next full version of CS becomes available, you will have up to a year to download and install them, and they will run on your computer along with CS6 versions.