According to "sources close to the game", the upcoming Batman: Arkham Asylum has been pushed back from its planned June release date to sometime later in the year.
Speaking with Game Informer, the sources reckon the game will instead ship in the "fourth quarter of 2009". Apparently neither the game's developer, Rocksteady, nor its publisher, Eidos, were willing to comment, which in the absence of a "no, silly, game's on track" seems to suggest this rumour might have some weight behind it.
Batman: Arkham Asylum Delayed? [Game Informer]