It was the current generation flagship smartphones - the Galaxy S8 and Galaxy S8+ to feature the Infinity Display covering the whole of the front panel at first. As this kind of display was well received by the consumers and critics in the industry, Samsung implemented the same for the Galaxy Note 8 as well.
Having said that the three flagship devices from the company have the Infinity Display, it makes sense to expect the same to be used in the upcoming premium smartphones from Samsung as well. According to a tweet by the leakster @mmddj_china (via SamMobile) the Galaxy A series smartphones meant for 2018 will also be launched with the Infinity Display.
For now, there is no information on whether Samsung will increase the screen resolution of the Galaxy A (2018) that might feature an Infinity Display. We can expect the resolution to be bumped up to QHD 1440p in the next year. Said to feature the Infinity Display panel, the Galaxy A (2018) is believed to arrive with dual-edge curved displays along with extremely thin bezels at the sides and bottom. Eventually, the screen-to-body ratio on these will be higher than the current generation Galaxy A smartphones.
As of now, it is too early to figure out what else we can see in the Galaxy A (2018) series smartphones. It is known that the next generation models will arrive with upgraded materials and feature a dual rear camera setup as well. We have already seen that the Galaxy A and Galaxy C series smartphones of the next year will feature dual rear cameras.
Needless to say, Samsung has not revealed any official confirmation regarding the Galaxy A (2018) for now. Until there is a word from the company, we need to take this information with a grain of salt.