I would know if the icons, the gadgets and the other elements that aren't anti-aliased in the shots will be
smoothed so to reach a real consistent overall look ?
There isn't much point in "antialiasing icons", since they are bitmap images as apposed to vector images. If the icon system supported alpha-channel, the icons could be properly antialiased by the artist.
I don't see any reason why border gadgets, and other system vector images can't be antialiased, though.