According to serebii, Pokemon.com just released something, that says turtwig's ability is Clorophyll, Instead of overgrow like the other starters. I went to the site to check it out, and this is what i found.
http://img174.imageshack.us/img174/2479/overgrownw9.png
Where do you see clorophyll?
http://img174.imageshack.us/img174/2479/overgrownw9.png
Where do you see clorophyll?