Sonos has filed a new design patent for noise-canceling headphones. The design is more refined than what we saw in a USPTO filing in September. A USB-C port, buttons, and a 3.5-millimeter cable input are also sketched out. Sonos CEO Patrick Spence confirmed last week that the next Sonos product will be announced in March. The headphones could wind up being that second new offering for 2021 — assuming they don’t make a surprise appearance next month.