According to David Cui, Chief Financial Officer at Huami (The company responsible for the line of Xiaomi Mi Band, Amazfit smartwatches and trackers), the Xiaomi Mi Band 4 will land sometime this year.

The full quote by The Motley Fool is:
Thank you, Jason. For Mi Band 4, it's going to be in this year. It will be in 2019. But I'm not sure, it's going to be in March and April. But, it is going to be in this year. So, right now, Mi Band 3 is still hot sale -- is still -- so really, really well. The margin is not shrinking, the shipments are not shrinking. So we will pick -- work with Xiaomi to pick the right time to launch Mi Band 4 in the year.

The call also revealed that the Xiaomi Mi Band line, as well as the line of Amazfit products, are doing exceptionally well. According to the call, Huami grew revenues by 78 percent in 2018, “propelled primarily by the strong sales of Amazfit’s smartwatches and the Mi Band 3.”

The Xiaomi Mi Band 3 received glowing reviews. When the Mi Band 4 lands later this year, it will continue Xiaomi’s successful trend of powerful fitness trackers at very reasonable prices.

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