Looking ahead: any Moto Mod you buy now will be supported by the Moto Z3, but maybe not the Z4

Motorola has officially confirmed that the Moto Mods will have “three generations of support”. Meaning that next year's Moto Z3 (assuming it's called that) will also fit nice and snug to the separately-bought shells.
So, but as many Mods as your heart desires with the confidence that they will be considered current technology up until mid-2019. We'll see what happens after...
source: TechRadar
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