The upcoming Moto G6, G6 Plus, and G6 Play would all sport 18:9 touchscreens, and this has been confirmed by their listings in the database of HTML5test.
The leak mentioned 2,160×1,080 resolution only for the G6 and G6 Plus (and 1,440×720 for the G6 Play), if the data in HTML5test is accurate then it looks like all three will actually sport the higher-res display.
The G6 Play will carry the model number XT1922, and according to its recent Wi-Fi certification it will be powered by the Snapdragon 430, and launch running Android 8.0 Oreo.
Alongside the G6 Play will carry the XT1924 and XT1944, both of these coming with the Snapdragon 425. They will run Android 8.0 Oreo from day one too.
The G6 should arrive with the Snapdragon 450 on board, while the G6 Plus will sport the Snapdragon 630. The G6 and E5 families may in fact become official at MWC in Barcelona towards the end of this month.