I hope that the Big Band will have some Breathy Tenor Sax samples (lZoot Sims, Lucky Thompson, Ben Webster etc.) as well as some smooth Alto Saxes (Johnnie Hodges, Paul Desmond). I personally do not care for the Duck Call style sax sounds that are so popular with most jazz fans, the only types of Sax sounds that most hardware synthesizer producers seem to be aware of.
I also second the call for classical Saxes for the GPO/Advanced GPO sample library. Like some others have said if you have not heard a classical Sax (Tenor, Alto, Baritone, or soprano) you have no IDEA how beautiful a sax can sound.