I use Kirk Hunter's "Virtuoso Strings" in my work, and it sounds to me like he is addressing most of the (few) weaknesses in the library. The solo strings in the "Virtuoso Strings" library are some of the few that I find playable to begin with, so he is building on strength there, but the original library is a bit short on string effects and the lower sections of the string orchestra are not as fully conceived as the violin section. It is good news that those areas are being addressed in the new library.
Kirk didn't give me a specific release date, but said it will be "soon". I'm looking forward to it.
AlbertMore From: ILIO