Blizzard will be taking a tough stance on anyone trying to run bots etc but it looks like Warden could be getting heavy with people running the game on linux under Wine. The account that was banned was running PlayonLinux with Wine 1.5.5-DiabloIII_v3 (64bit), OS Ubuntu 12.04 64bit.
This is not the first time this has happened with linux, back in 2006 we reported that World of Warcraft accounts were being banned for running under Cedega and eventually Blizzard worked with Cedega to resolve the problem and accounts were unbanned.
If you are playing on Linux and are concerned it may be an idea to preempt any banning and contact Blizzard support and make sure they are alerted to the fact. If enough players using Wine do this, perhaps they can update their systems to avoid future bannings.