does anyone knows if the new 11speed hubs from HED are 10speed cassette compatible? Does it comes with the spacers needed if it does?

All Shimano format 11 speed hubs are 10/9/8 speed compatible with a spacer. The spacer is 1.8mm thick. I don't know specifically whether HED hubs come with the spacer, but of the 11 speed hubs I've seen, I've yet to see one that doesn't.