OnePlus 6 itself is not released yet but the avengers edition OnePlus 6 is confirmed. It will be same as OnePlus 6 but with Marvel Avengers aesthetics.
When Android Central asked the company about this they stated “OnePlus’ association with Marvel Studios is a manifestation of the enduring love and support they have garnered from its respective community over the years with a purpose to go beyond the ordinary and achieve groundbreaking innovations in mobile technology only to create the best user experiences, noting that the deal marks a step towards strengthening our association with Disney India.”
From the official statement it looks like this avengers edition device will be India exclusive same as Star wars edition was. The original OnePlus 6 to launch soon with snapdragon 845 processor, with water resistant capabilities and of course with a notch.