The teaser of the upcoming rebranded Mi 6X does not reveal much, but the essentials are supposed to be the same as in the case of the very popular Mi A1 when compared to the Mi 5X. Basically, the Mi A2 will have the same specs as the Mi 6X but will run stock Android instead of using Xiaomi's MIUI interface.
https://www.notebookcheck.net/Xiaomi-teases-the-upcoming-Mi-A2-on-Twitter.316504.0.html