it looks as if most of DAW users using orchestral sample libraries for kontakt anyway, maybe steinberg feel they not gonna get much profit from investing time and money for new HSO2 from scratch ?
but again if they remain silent maybe they are planing something under the hood ?
mmmm…speculations are great isn’t it ? 
i too just thought of getting HSO 16bit for 100$ that comes with C6, but it indeed looks too old now and not supported so i give it up for now…