I guess it was more than 6 months ago, little over a year on the texture one, but here is them changing their stance on the texture update banwave. There was a separate post where they announced the ban itself.
I would have to find the post where they talked about having just made a ban wave on cheaters but they have been making posts about ban waves. Not sure where they said they would stop doing that.
The only numbers I am aware of Blizzard not making public anymore were sub numbers.