Hearthstone players. If you've been using a bot to automate your gameplay, you'll log in today to find a shiny new prize! Specifically, that shiny new prize is not being able to log in because you've been banned. Your prize was being banned. Blizzard has awarded this prize to "several thousand" Hearthstone accounts using third-party tools to automate gameplay; the bans are permanent, so no need to worry about losing them at the end of the season.
Players who have not been botting and violating the game's TOS will also log in to find a shiny new prize, which is a play environment with far fewer bots. Isn't that nice? The official post reminds players to report suspicious behavior by emailing the development team so that in the future another group of cheaters can wake up to find a brand-new lifetime ban locking them out of the game.
Those of you who can still log in may also want to take the opportunity to vote on the next teaser for the Goblins vs. Gnomes expansion.
[Thanks to Dengar for the tip!]