The latest issue of PSM3 has posted dates for Hitman: Absolution. They mentioned that Agent 47′s latest mission lands in December of this year.
Update: The Grand Theft Auto V date was a result of bad editing, PSM3 has confirmed. We’re not sure about Hitman: Absolution date, but the magazine did mention “a couple of small errors may have slipped through.”
Update 2: Square Enix has said that it has not released a Hitman: Absolution date beyond the general 2012 release window.