Sordino strings are already announced for the new Duality collection. It's very interesting.
I wonder though if sordino libraries will be provided for Synchron Pro and Synchron Elites strings. Since the release of these libraries (and even the Synchron I's I bought too), I've been hoping that the next new product announcement will be sordino strings for the collections I already own. In short, should I buy a new collection (again) to finally have Synchron sordino strings? In the meantime, I use the old SYNCHRON-ized collections which are very good, but very different.