OnePlus has hinted at something called WarpTen on its Weibo page. Given the term's similarity to the OEM's latest charging standard, it may have something to do with improved charging for the upcoming 7 flagship. However, the post's proximity to April 1, 2019 may cast doubt on this prospect.
https://www.notebookcheck.net/OnePlus-teases-WarpTen-which-will-accompany-an-April-1-2019-announcement.415532.0.html