I think GMs are taking a more active role. Apparently I was reported as botting, a GM researched and noticed I was playing from Bermuda IP address when my account says I'm in Connecticut and locked my accounts (that's what the phone rep said happened). Not a ban, but it is the first time this has ever happened to me. After a couple phone calls I was able to get my account unlocked. There is increased focus on multiboxers, but it could just be the result of Blizz stepping up their game against bots and us getting caught in the crossfire.