This wiki is not sponsored/created officially by Kairosoft Company and/or staff. So unfortunately I don't think you'd find the answer here. The general consensus of Kairosoft's reddit comunity, however, is that Kairosoft is translating their older games to Chinese and probably Korean too. That's why there has not been any English releases yet.
Whether this will continue in the distant future or not are remains to be seen.
Personally though, I'd wait from March to August / Sep for any new English releases. That's usually the general time when they released new English releases.