The band is collaborating with the Arnette sunglasses company on a new line of Slayer-branded products.
The eyewear line is not yet listed on Arnette's website nor are they given a release date. They're just announced and sort of existing in an existence-less void at the moment. At the end of the day people will buy these glasses and the band (and company) will make some money off the whole affair. To an extent I suppose that's what it's all about; being able to support yourself an your family on the brand you built, which in this case is Slayer.