2018 for sure, love the setting, combat (seriously that returning axe, so good!) and story. Easily my game of the generation.
Expect to see more of the same from the first game, and possibly larger in terms of explorable areas. The rest of the Norse story with Kratos/Atreus and some epic fights - even more-so than the first. Hoping for bigger (scale) and badder boss battles like of the previous games. And a new weapon or two like a spear or bow. From the trailer there are new shields in the game.