The release dates for MotorStorm have been confirmed by Sony and Evolution Studios with Europe getting the game before it hits North America.
The PS3 exclusive off-road racing title will be available in Europe on March 16th with the North American release date being April 12th.
A New Zealand and Australian release date for the game has yet to be announced but I have contacted Sony New Zealand, and will update you on the release date for the game down under.