Ok, guys! Got some insider news from Stiga's Marketing responible Felix, which is a really great guy to talk with. Well I asked about the new blade that Xu Xin is using and he told me some details about it.
It is a 5+2 outer carbon blade where the outer layer is brown koto and the core is abachi. Xu Xin didn't like the colour of the dyed grey koto that the DHS 301 had. It is going to be released in the third quarter of this year. Approximately September or October this year and first in China and Japan and a few weeks later in the rest of the world. The blade should more or less be in production and it will come in a commercial and limited edition with Xu Xin's personal lens. Something to look forward to guys!