This Whole Foods store for millennials could be the company's future under Amazon

Whole Foods CEO John Mackey has signaled that big changes are coming to the grocery chain in the wake of Amazon's $13.7 billion bid for the company.

"I don't know if you know that - they were, like, ranked the number-one most innovative company in the entire world," founder and CEO John Mackey told investors of Amazon after the deal was announced. "I think we're gonna get a lot of those innovations in our stores. I think we're gonna see a lotta technology. I think you're gonna see Whole Foods Market evolve in leaps and bounds."

It sounds like Whole Foods traditional store model could soon be replaced entirely by one that resembles a cross between the company's cheaper chain of stores, called 365 by Whole Foods Market, and Amazon's newly unveiled grocery store concept with no cashiers, registers, or lines.

Whole Foods has only four 365 stores in operation so far. Here's what one of them looks like.