I didn't find this information in the FAQ so I've decided to post it.
I purchased an upgrade from CS4 (boxed copy) to CS6 (ESD) last year via the electronic software download. I've now received an email from Adobe saying licensing for CS6 will no longer be sold. Ok, they will not be sold, but does that affect my purchased download of CS6?
No. It's a perpetual license and is unaffected by future sales of CS6.
Individual CS6 sales continue... halt is only for CLP & TLP (Volume Licensing)