Your SA probably meant that H won't issue the 90cm cashmere/silk for Spring/Summer 2008, the same way that H did not issue any cottons for AW2007. I haven't heard that it will be discontinued.
For AW2007 in 90cm cashmere/silk, the available designs are: 1. Pani la Shar Pawnee 2. Jardins d'Armenie 3. Caleche Elastique 4. Couvertures et Tenue de Jour. There could probably be more.