This is the Woz getting fit for custom earphones at CES 2015. You can read all about it at part two of Head-fi's CES 2015 Highlights.
The coolest part of the story (and probably why the Woz even showed up to the booth in the first place) is the 3D scanning technology United Science utilise in taking impressions of an ear. That technology is called eFit. It appears to be both safer, and more reliable, than traditional silicon impressions.
Thanks again, Mr. Pith, for pointing this out.