The debut of the 2013 Mitsubishi Mirage in North America will take place at the Montreal auto show on January 18th, 2013, otherwise known as the Salon de l'Auto International de Montreal:

http://www.montrealautoshow.com

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Note - see the U.S. debut details from the NY international auto show here: 2014 Mitsubishi Mirage U.S. debut in New York: details, photos, specs.
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Details about the car -- even its name -- are currently under wraps by a press embargo. The 2013 Unveilings list on the show web site says only:

North American Premiere: Mitsubishi: model to come (embargo) / (modèle à venir (embargo))
However, we have at least confirmed the car's name: it will wear the Mirage badge, as it does in the rest of the world where it has recently gone on sale.

At least one dealership has said the car will be available for sale in Canada in March (edit: now Mitsu is saying autumn). The U.S. will get it in September.

This month's Montreal debut of the 2014 Mirage comes just one year after Mitsu showed off its "World Car Concept" on the show circuit. The concept car was a thinly disguised version of the production car.