Motortstorm Apocalypse faces an indefinite delay in North America in the wake of last week's earthquake which ravaged Japan. The game was similarly postponed in both the UK and Japan last week.
It's no surprise that they would postpone a racing game that's set on a world ravaged by earthquakes. Releasing the game now would be a case of "too soon".
SCEA has not announced any new date for the game's release.