Judging from the pictures they'll still use paper price labels. Why? It seems extremely arcane to still use paper price labels in 2017, especially for stores as big and centrally run as Walmart. With digital price labels you can update prices centrally across the whole country within seconds, and it costs basically nothing to implement too, when the labor cost of manually updating paper price labels are factored in.
Now imagine thru some method, they could tell which shopper was nearby shelves, looking - and who they were. Do a instant credit check lookup (perhaps with something special with the credit bureaus that don't put a ding on the report), to find out what that nearby shopper is "worth".
Then instantly change the prices in that one area of the store - perhaps to gain just a few more pennies from a wealthy customer, or maybe (perhaps) to try to steer a customer to a particular brand who has paid the store for this purpose (by changing the prices of other brands to be higher, so that the buyer might go for the lower priced item if they are on a lower economic rung - or vice-versa to get them to buy a higher-cost item for perceived "luxury").
This would be easily possible with today's technology. It wouldn't be cheap to implement, and likely the back-end systems are so f-d up that it would take a revamp or a lot of work to get everything talking together properly, plus the attendant tech to recognize shoppers (cell phone IMEI? facial rec? something)...
...but I am certain that if the profit motive was there, and it offset those costs, it would be done. And Walmart would likely do it, too.