The OnePlus 6T is one of the high-profile smartphones billed for an October release and details of the device have made their way across the media. Here's all we know about OnePlus's next flagship.
https://www.notebookcheck.net/More-details-of-the-OnePlus-6T-surface.335912.0.html
3.5mm jack or double USB-C... Second option is currently only a wish. Anyway, unless second output fully replacing jack is released I would NEVER buy a phone without it. This is quite fundamental question.