GM released some more renderings...
These ones let the cat out of the bag in terms of engine choices: the turbo option will apparently make it to production (1.4L likely - the same motor as the Cruze).
But GM hasn't quite got their act together with these renderings - they keep releasing them with various inconsistencies from batch to batch.
Most obvious "mistake" in this set is the 4-lug wheels. (The production car will have 5-luggers - see the on-the-road spy shots or the Paris production Aveo debut photos.)