Will Synchron Strings II be a Con Sordino update or more articulations/dynamics/legato/vibrato styles?
If you look at Solo, Chamber and Dimensionstrings it has at least been hitherto a VSL-Concept to provide nearly a full set of Articulations in sordinoversion as Volume II. Nevertheless this time there seem to miss at least also some more "experimental" patches, like Sul pont and Harmonics which were hitherto always covered by former VSL-Libraries.
So my personal guess would be, that a SynchronStrings II would primarily cover those types of articulations. Meanwhile it seems to me that the Legatos and Dynamics and Vibratos are already in Synchron Strings I with a bunch of variations and their combinations quite well represented. So let us explore what is already there first before asking for more.