Blizzard reminds us that cheating is not allowed in Diablo 3
Blizzard further explain that they normally remind players of their stance against cheating before doing a ban wave - so expect one of those happening soon.
Blizzard Entertainment has always taken cheating in any form in Blizzard games very seriously, and that's no different for Diablo® III. If a Diablo III player is found to be cheating or using hacks, bots, or modifications in any form, then as outlined in the Diablo III end user license agreement, that player can be permanently banned from the game. This means that the player will be permanently unable to log in to Battle.net® to play Diablo III with his or her account.
Playing Diablo III legitimately means playing with an unaltered game client. Doing otherwise violates our policies for Battle.net and Diablo III, and it goes against the spirit of fair play that all of our games are based on. We strongly recommend that you avoid using any hacks, cheats, bots, or exploits. Suspensions and bans of players that have used or start using cheats and hacks will begin in the near future.
@ArdenTDG: It's not as though this is something new. We tend to remind players of our stance against cheating before doing ban waves. For perspective, this blog was published within about two months of StarCraft II's release, very shortly before the first ban wave went out: http://us.battle.net/sc2/en/blog/809157