Naughty Dog have confirmed that The Last Of Us has been delayed until 14th June. the game was originally announced as coming out 7th May, but now Naughty Dog say "...instead of cutting corners or compromising our vision, we came to the
tough decision that the game deserved a few extra weeks to ensure
every detail of The Last of Us was up to Naughty Dog’s internal
high standards."
Source: USA PlayStation Blog