As we all know, every major smartphone manufacturer releases a major new model at roughly the same time every year. We can pretty much guarantee that there will be a Samsung Galaxy S9[1] releasing at or around the time of next year's Mobile World Congress[2] trade show, with a Galaxy Note 9[3] following in the second half of the year. Similarly, Apple[4] will almost certainly refresh its budget iPhone SE[5] offering early in the year, and trot out its iPhone 8 and iPhone X replacements[6] in or around September. HTC[7], LG, Sony[8], OnePlus[9] and Xiaomi[10] will also release new flagships in the first half of the year, depending on when Qualcomm[11] can ship its upcoming Snapdragon 845[12] processor in sufficient volumes.
It's a bit too early to know exactly what shape or form any of these phones will take, though we do have a few leaks that seem legitimate. Apple's products have gone from being some of the most secretively developed in the world to the most[13] widely[14] leaked[15], and there are strong rumours of three new models[16] in 2018, all designed like the iPhone X[17]. Two are said to have OLED screens and glass bodies, while the third would be a lower cost model with an LCD screen and a metal body in multiple colours. It's likely that all three will have Face ID since there won't be room for a Touch ID sensor.