I have asked several times over at the Sibelius forum about this, and Daniel recently wrote me back to say they just received their copies of these libraries from Garritan (about a week ago, I think). Why has it taken this long? Who knows? But it appears they are working hard to produce the soundsets for these VSTis, and should have them available shortly, at least so they claim. This is one of the main things holding me up in deciding whether or not to upgrade to Sib 5.