Well, the pre-release ones did. Back on June 11th, my access logs showed a user agent of:
Mozilla/5.0 (iPhone; U; OS X Leopard 9A365; en) KHTML
Today, that user agent has become a mine field of keywords for UA parsers:
Mozilla/5.0 (iPhone; U; CPU like Mac OS X; en) AppleWebKit/420+ (KHTML, like Gecko) Version/3.0 Mobile/1A543a Safari/419.3
I guess it makes sense, given all the UI flashyness that would come from Core Animation and Core Image.