I think that's the highest SN we've
seen so far, but it's not that far above the others (only ~5k). I haven't seen any indications that Sony has started using Vizplex. In fact, everything I
have seen says that Vizplex isn't out yet.
I think it's most likely that you got an unusually 'white' example of the current stuff, rather than the new stuff (that's still a good thing).