MIUI 12 supported mobiles have been listed in GizmoChina website recently. MIUI 12 is on the ongoing process and soon will be available in multiple Redmi and Xiaomi Mobiles.
List of MIUI 12 supported mobiles.
- Xiaomi Mi 10, Mi 10 Pro, Mi 9, Mi 9SE, Mi 9 Pro, Mi 8
- Xiaomi Mi CC9 Pro, Mi CC9, Mi CC9e
- Xiaomi Mi Mix 3, Mi Mix 2s, Mi Mix 2
- Redmi K30, K20 Pro, K20
- Redmi 8 Pro, Redmi Note 8, Redmi 7 Pro, Redmi Note 7, Redmi 8, Redmi 8A, Redmi 7, Redmi 7A
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So the above smartphones can be expected to get the MIUI 12 feature. The devices not listed in the above in get these update in later stages.