Sorry, one more related question (after I have re-read some info):
I read in the comparison guide, the only thing that Creative Cloud don't provide is to open your files permenantly. I suppose this is because if you have produced files with Creative Cloud CS6 and then fail to continue to subscribe, you won't be able to open those files. However, if all the applications is the same as those in a permenant license, you could save your file out to an older version (unless you use features that are not there in the previous version).
That being said, I suddenly have this frightful feeling that in order to keep my files usable, I will now be perpactually tied to paying Adobe subscription into infinity ...