No further information was divulged, though the developer could be teasing an announcement of one of the two previously announced story-focused Dishonored expansions that will be released in 2013.
The first will focus on Daud, the leader of a legion of supernatural assassins known as The Whalers. It is due out sometime this spring.
Dishonored launched in October and was the United States' fourth-best-selling game of the month. It was also the only non-sequel to make the top-10 chart during the month. The game's first expansion--Dunwall City Trials--launched in December.
For more on Dishonored, check out GameSpot's review.