Update: August 12, 2019
Announcing the S1 Play-Through Cover. This new cover is available in four colors — Baltic Blue, Night Orchid Red, Nue Bose Black, and Nue Arctic White. This makes it easy for musicians to update the look of their S1 to suit their style or to match the aesthetic of a particular event. Each cover is durable, with a sleek, fitted design featuring a high-quality zipper and acoustically transparent stretchable fabric that doesn’t compromise sound quality.
These should be available through retailers starting the week of August 12, 2019.
Bose will announce when these will be available soon.
In the meantime I got my hands on a few and pulled out my phone (hence, the not so great pictures below). But I thought you'd like see some more.
Notice how nicely the white one fades into the background.
When Bose makes a formal announcement about these, I'll post that here in this discussion.