Yes S2 is back..But at the moment only for the new Knot 2 card. Seams strange to me that they want us to buy a new card, I for one will not go for it, as the K1 card was very badly supported. Also SLY are about to knock off all of their S2 early next year in favour of VG, so it looks like only a 2 month window.
Maybe the keys will leak....and will work for other cards.