Maybe this is the announcement which was teased by IO Interactive yesterday.
Hitman: Sniper Challenge was leaked in the latest Game Informer magazine as an ad. This might be the announcement teased from IO Interactive. The Sniper Challenge is available if you pre-order Hitman Absolution at GameStop.
It includes a replayable sniper mission, an exclusive riffle with upgrades and prizes for the best snipers. Publisher Square Enix trademarked the "Sniper Challenge" in January 2012. Here's an image of the advertisement. Click to enlarge.
■ Jensen6