According to the latest info the next device that Xiaomi will be launching is the Xiaomi Mi A2, the next purely android phone by Xiaomi. This probably would be launched in Spain, since the Mi Explorer promise
Xiaomi Mi A2 is expected to share its hardware with Xiaomi Mi 6X but run stock Android, instead of the in-house MIUI. That would mean a Qualcomm Snapdragon 660 chipset coupled with 4GB or 6 GB RAM.
The dual camera on the back is 12 MP + 20 MP and comes with AI enhancements.
The announcement appeared on the Mi forums, and Xiaomi is giving an opportunity to few more hardcore fans to be at the event. Between July 11 and July 18 you can enter your info and will eventually be selected, but you have to cover your own travel and accommodation fees.