In 2016 with OnePlus 3T, OnePlus has started a trend to launch two flagship devices a year where the T variant will be an incremental upgrade to the regular variant. And in 2018 they also going to follow the trend and will soon launch the OnePlus 6T. According to the sources, OnePlus has already partnered with T-Mobile network in the US and could launch the OnePlus 6T in the USA somewhere in October.
But recently a OnePlus device with the model number A6013 is popped up in the certification on Eurasian Economic Commission (EEC) in Russia. And we are assuming that the OnePlus A6013 could be the upcoming OnePlus 6T but there is no specifications are out yet. According to rumours, the OnePlus 6T will have 6.4-inch AMOLED display with a water drop notch. It will be powered by the Snapdragon 845 chipset coupled with 8GB of RAM and 128GB of internal storage.
It is also rumoured that the OnePlus 6T could also house an in-display fingerprint scanner and a variable aperture camera like Samsung S9. But as of now these are just rumoured so take it with some pinch of salt. We advise you to wait till the October Launch then we will have more details about the flagship.