The big difference is that there will be few sitting on dealer lots since 95% of them are pre-orders by customers from as early as October last year. The fact that Ford Dealers still have any sitting on the floor at all shows the difference in the interest in the two cars, even with the redesign. The only Camaro's you will see on the floor right now are from dealers trying to get over sticker.
Plus, I am sure Camaro will outsell the Mustang 100 to 1 in 2010. Especially with all the comparison reports pointing out and saying the "OBVIOUS winner" and the "Unanimous Decision" goes to the camaro.
2010 is the year of the Camaro.
Let's also not forget that this is STILL pretty early to see 2010's of ANY car. Years ago you could not get next model year until August/September....and that was early.