Valkyria Chronicles 4 Has Been in Development for Two Years; Aims to Return to the Series' Roots
SEGA surprised and excited many longtime Valkyria Chronicles fans (including myself) with the announcement of Valkyria Chronicles 4 for PS4, Xbox One, and Nintendo Switch yesterday. Today, in an interview on the PlayStation Blog, Producer Kei Mikami gave us even more information about the title.
Apparently, Valkyria Chronicles 4 has been in active development for about two years, with the planning phase of development going back even further:
I have a lot of high hopes for this game. There's a ton of potential here, and they're saying some really great things about the game.

I am really excited for this game, I mean it.
I am really excited for this game, I mean it.
I am really excited for this game, I mean it.