No, it does not. At least in 3.0 and 3.2. The high contrast would be too much for me, anyway.
(Btw. In the default theme, the look-and-feel of GNOME 3 seems to be less uniform/consistent than GNOME 2. Some windows/dialogs look completely different than most. But maybe these things are fixed in 3.4, which I will try as soon as it is in Debian.)