I am glad they are doing it, (for multiple reasons)
even though I don't personally eat there.
As a different issue, I do wonder what the list of ingredients are.
That would determine for myself, whether I would want to order it,
if I ever did go there.
What is in it? 
From the article:
"The new burger has launched in partnership with the US-based, meat-substitute brand, Beyond Meat, and is made from plant-based ingredients including yellow peas, coconut, potato and beetroot juice. What's more, it's topped with vegan cheese and a vegan sandwich sauce."
and Beyond Beef's ingredients (as on their site):
"Water, pea protein*, expeller-pressed canola oil, refined coconut oil, rice protein, natural flavors, dried yeast, cocoa butter, methylcellulose, contains 1% or less: potato starch, salt, potassium chloride, beet powder color, apple extract, pomegranate concentrate, sunflower lecithin, vinegar, lemon juice concentrate, vitamins and minerals (zinc sulfate, niacinamide [vitamin B3], pyridoxine hydrochloride [vitamin B6], cyanocobalamin [vitamin B12], calcium pantothenate).
*Peas are legumes. People with severe allergies to legumes like peanuts should be cautious when introducing pea protein into their diet because of the possibility of a pea allergy. Contains no peanuts or tree nuts.
