Since Digimon: Hacker's Memories and Ni no Kuni II are both out (and both are reportedly good, but not as good as the first games in their respective series), and Kingdom Hearts 3 is no longer a 2018 game (to the surprise of no one, I'm sure), I'd say:
Metal Max Xeno and Dragon Quest XI. The former is from a niche series I've always loved, the latter is a much anticipated entry in a series that has been evolving at a snail's pace to the point where it usually scratches that retro itch while still offering a new modern experience.
EDIT:
Actually just read through the previews on this site, and I think Valkyria Chronicles 4 just jumped up a good deal higher on the list. It sounds like it'll be true to the series mechanically, and I'm looking forward to just getting to play more of it on the big screen again.