The Huawei TalkBand B6 wearable has become the chief suspect for a teased product launch by the popular Chinese OEM. Although the promo image doesn't specify what device is being marketed, the curved display certainly points to the TalkBand B6 fitness tracker and Bluetooth headset. A launch date of July 30 is also mentioned.
https://www.notebookcheck.net/Huawei-TalkBand-B6-fitness-tracker-with-SpO2-sensor-most-likely-suspect-in-official-teaser-that-reveals-product-launch-date.483285.0.html