I expect the game will eventually be canceled, but as of now, game on!

NJ.com:

When the Giants and NFL made the decision to move up Saturday’s preseason game against the Jets to 2 p.m., team president John Mara said they did so “to give everybody an opportunity to get home safely after the game.”
Now, with Hurricane Irene bearing down on the area, they’re thinking about postponing or canceling the game altogether for the same reasons.
Though the forecast for the time of the game is currently reflecting conditions that shouldn’t greatly affect the quality of what occurs on the field, the Giants and the league are exploring their options in regard to moving the game, team senior vice president of communications Pat Hanlon said.
Hanlon didn’t get into specifics about the discussions, but it’s likely the safety of fans and workers is foremost on the minds of the Giants and the NFL. Gov. Chris Christie announced earlier today New Jersey Transit trains will stop running at noon — two hours before scheduled kickoff — which means fans won’t have the option of taking public transportation in leaving the game.

The last thing you want is extra people on the roads, even in a best-case scenario for the storm. I’m actually surprised they haven’t made a decision yet.