GM announced that the US-spec version Chevrolet Aveo will use the Chevrolet Sonic nameplate, and that production for the new small car will be gin in 2011 at GM’s Orion Assembly Center in Michigan.
The Chevrolet Sonic will also be used in Canada and Mexico while the rest of the world’s markets will still use the Aveo name.
The Chevrolet Sonic looks identical to the Aveo model that was introduced at this year’s Paris Motor Show, but in case there will be any differences, we will need more than a rear side photo.
We’ll be back with more details on the new Chevrolet Sonic as soon as the North American car maker will release them. 
GM press release :
DETROIT – Chevrolet announced today that its all-new, U.S. built small car will be called the Chevrolet Sonic in North America.
“The Sonic represents a new beginning for Chevrolet in the small car segment and so we felt it was time to give it a new name,” said Chris Perry, vice president, Chevrolet U.S. Marketing. “The new car is roomy, stylish and fun to drive, and Sonic is a youthful, energetic name that helps convey what this vehicle is about.”
The small car will carry the Sonic name in Canada, Mexico and the United States. Production of the Sonic begins in 2011 at GM’s Orion Assembly Center in Michigan, which received a $545-million investment in upgrades and retooling, and will help restore approximately 1,000 jobs in the metropolitan Detroit area.
The vehicle will continue to be called Aveo in other parts of the world, where it will be sold in more than 50 countries. 

Source: GM