MicahW on the Bannination
This caught me by as much surprise as any one. If this is similar to the Warcraft 3 CD-Key bans it would only be the original (non-expansion) key that will be banned. I will have more information regarding temporary/permanent in a bit. Again, if it is similar to Warcraft 3 it will be temporary (30 days) for a first offense (almost everyone is going to be on their first offense) and permanent for a second offense.
This is all assuming it is similar to the Warcraft 3 ladder bans, which may not be the case.