https://en-us.sennheiser.com/headphones-audiophile-high-end-hd-660-s It's listed as available soon on Sennheiser's website. Rumor is it's a HD700 driver with a different housing and pads, and tuned for a less peaky, more neutral response. Will retail for $500.00. Makes sense with their recent HD6xx drops at $200 that they are launching a model, especiall since the HD700 itself has seen a massive drop in price from $999 to the $400-450 range, that they want a model to occupy the $500 space and drive sales. $500 space is starting to get competitive which is nice, will be nice to see how this competes with the upcoming Hifiman Sundara. Whose gonna get one?