giorgospI received mine a few days ago. Has both brightness display and subwoofer output. I’m using both those features. Subwoofer requires a standard 3.5mm TRS male to RCA male Y-cable splitter (not provided). I had a spare. Also used an 3.5mm extension to reach subwoofer until I have time to build some custom length cables.
giorgospIt's version 3.0 according to boot screen. Black small plastic remote and subwoofer out. It comes with US plug. Plug connecting to the power brick is common so you should not have problem replacing cable or you can just buy US plug converter to your local plug. I've connected it to power meter and when playing music at volume level 30 it takes 7W.
Plug connecting to power brick looks like this and not like on Massdrop's product pictures.