Nah, people thought HD650 was the end of the HD600. Nope.It's showing on the US site, too. https://en-us.sennheiser.com/headphones-audiophile-high-end-hd-660-s
Interesting how it's 150 Ohms. Slightly higher efficiency, too.
I wonder if this means the end of the HD 650.
I bet my finger a lot of people are going to love it while others hate it while preferring the current gen models.