As I understand it, one of the main things that separates classic autism from Asperger's, is speech delay. Kids with classic autism don't start speaking until much later than average, or never at all. I did not start speaking until after I was 8 years old.
However, people with Asperger's sometimes have what is called selective mutism, which makes them nonverbal a lot of the time. And like kraftiekortie said, there are people with autism who have dyspraxia, which I have as well. Also called apraxia of speech. And then there are people I know of with autism who are very talkative.