Samsung introduced autofocus to the front camera with the Galaxy S8, but that had been a software-based thing. It worked well enough, but it was no match for actual hardware-based autofocus that you see on rear cameras on phones. Dual Pixel phase detection technology was introduced to the Galaxy lineup with the Galaxy S7 and Galaxy S7 edge, and while at the time it was only used in DSLRs, it's quite common in the smartphone world in general these days.
You can get the technical details on how Dual Pixel technology works on Canon's site here, but simply put, Dual Pixel autofocus is one of the best autofocus techniques out there, as it allows each of the million pixels in the camera to help with focusing. Dual Pixel autofocus is extremely fast, and that should mean the Galaxy S10 will be able to focus on your face much faster than we have seen any previous Samsung phone. Along with the increased megapixel count (10MP), the S10 trio should be considerably better than previous Galaxy flagships as far as taking selfies is concerned.
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