Firaxis have just announced the launch of Civ 6 on the iPad!
This is the full game (but not DLC, except the Aztecs) rebuilt for touch to the iOS platform, you can play up to 60 turns without having to purchase it.
The suggested retail price of Civilization VI is US$59.99. However, the game will be on sale for 50 percent off for a limited time from December 21, 2017 to January 4, 2018. Prices and availability may vary by territory. Sale only available on the App Store.