http://www.tweaktown.com/news/43775/hgst-prepares-10tb-hdds-first-helium-filled-smr-tech/index.html
 
Pricing and availability unknown at this time

I'm not comfortable with the idea of SMR media yet. Helium was odd enough on its own, but if they are combining the two they had better be able to offer some real benefits to the customer for adopting both technologies. For example, HGST's current helium drives remain the most expensive 6TB model around.

http://www.hgst.com/science-of-storage/emerging-technologies/helium-technology 
 
The new drives are sealed and contain helium, rather than ordinary air. Because helium has one-seventh the density of air, reduced friction from the spinning disks lowers the electrical power consumed by the HDD’s motor. It also enables more disks to be packed closer together and allows data tracks to be spaced closer together on each platter, both of which increase a drive’s data-storage capacity. Helium HDDs also run quieter and cooler, requiring less external cooling.