White Castle has had Impossible Burgers available for about a year now. Just interesting to see the trend emerging from what I would consider the "bottom-most" market segment. I suppose they had the most to gain from drawing in a meat-averse audience.
Whatever your feelings on this particular product, it seems that the perhaps-inevitable decline of the traditional meat industry is going to take place on many fronts (clean meats, plant hemes, alternative proteins, locavore provider networks, increased availability of traditional vegetarian cuisines).