OnePlus had hinted at something "coming soon" via its Nord Instagram handle last month.
OnePlus will launch the OnePlus 8T on October 14 via a dedicated online event.
OnePlus will also launch a pair of earphones along with the OnePlus 8T, the company revealed in a separate teaser.
OnePlus had recently teased the 65W Warp Charge system on OnePlus 8T 5G earlier this week.
OnePlus has now teased the dual-cell fast charging technology on the upcoming OnePlus 8T.
OnePlus is expected to launch the OnePlus 8 and OnePlus 8 Pro in India on April 14, and its Amazon India landing page is now live.
OnePlus could be preparing to bring in 120Hz displays on its upcoming range of smartphones.
OnePlus 7 and OnePlus 7 Pro main launch event will take place at Pier 94 in New York on May 14 at 11am EDT, tickets for which will be available from OnePlus.com on April 25.
OnePlus 5T is set to launch today in an event in New York. Here is all we know about the upcoming bezel-less offering by OnePlus and why it will be a major upgrade from the existing OnePlus 5.