It’s being going on ever-since the launch of the iPhone XR: Apple has been dramatically promoting a trade-in and money off when you purchase the phone.
Now, in some regions, the iPhone Xs has joined the promotion, with a price of £779 and upwards (in the United Kingdom). The home page gives multiple options for the different devices.
The promotion suggests that you can trade your current iPhone in at an Apple Store, and get money off a new one. In Addition to this, Apple is advertising the XR and Xs right underneath.