Earlier quoted context omitted.
McDonald's has been testing one they call the McVegan, but it's only available in a few countries outside the US. With Burger King's version being available, I'm guessing that will speed up the availability of the McVegan in the US.
They could easily make their fries Vegan in the US, yet they haven't. I doubt they'll really bring it here.
"Our World Famous Fries™ and hash browns are go-tos for our vegetarian and vegan guests. Since 2007, we’ve made them without any animal-sourced ingredients. We cook them in 100% vegetable oil, in a dedicated fryer separate from our meat items."