I'm stopping by to vent, but I purchased the Final Fantasy 25th Memorial Ultimania Vol. 1 when it released last year, and it's served me incredibly well, but I'm so disappointed this hasn't (and likely never will) get a proper, translated release.
As a homebrew enthusiast, there's so many little tidbits of information that I just HAVE to know about in this book, mostly relating to the design documents listed at the end section of each game. I see one from Final Fantasy III that looks like it might detail a glitch they encountered during development, and various other documents about sizing up sprites on graph paper before turning it into dot art. It's all incredibly fascinating to me.
I guess I better start learning Japanese. Sigh~