Microsoft has officially shut down all Zune-related services, including the Zune Music Pass subscription program, and the Zune marketplace for buying MP3s.
Those still subscribing to Zune Music Pass (it's hard to believe that anyone actually remains) will be automatically switches to Microsoft's new Groove Music service.
Microsoft actually stopped producing new Zune hardware back in 2008, likely because it never gained sufficient traction in light of Apple's market defining iPod.