Although the upcoming OnePlus 6 flagship has no official launch date or price yet, both have been revealed in India. Last Thursday, MoneyControl published an article about this topic that was removed shortly after going online. According to it, the OnePlus 6 will launch on May 18 and will have a price of around US$602.
https://www.notebookcheck.net/The-OnePlus-6-to-be-most-expensive-OnePlus-phone-so-far-could-launch-on-May-18.300646.0.html