Samsung may have divulged the existence of a heretofore unreleased phone, the A91. It is included in a list of phones that work with the OEM's new 45W charger, alongside the Galaxy Note 10+. This phone may be an additional variant, or next generation of, the Galaxy A90.
https://www.notebookcheck.net/Samsung-accidentally-references-the-A91-on-its-new-45W-charger-page.432491.0.html