Yes, a full Ironman is returning to Coeur d' Alene. The plan is to rotate the Ironman North American Championships between 3 cities. On the two years where the city is not holding an full Ironman, it will have a 70.3 distance race in its place:
2020: St George
2021: Coeur d Alene
2022: ??? (not yet determined)

Here are a couple threads that talk about it:
https://forum.slowtwitch.com/...F_P6964438/#p6964438
https://forum.slowtwitch.com/...!_P7061912/#p7061912

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Matt