I think KZ realized how terrible the reception was when it comes to plastic seam on the ZS5, so they stepped it up a bit. There are some nice differences compared to Andromeda and they should have gone a lot further to differentiate themselves. Now the seam looks amazingly precise on the "KZ6", open back will probably give us better sound and less isolation, metal screw heads are a big NO from me, it's already way too similar to Andromeda, same goes for color (imagine this in dark red or orange).
Nice to have all of this info so early, including the price which looks to be phenomenal. A month from the release, these will cost around 25$, maybe even less.