And they also released an illustrated edition of Snow White. UPD (November 2022) Not long ago Minalima posted on their Instagram a video of something what might be a picture from the GOBLET OF FIRE 🔥🔥🔥 Which means they may be working on it already. There's just no any reason for Minalima or publishers to stop this project since people loved their artwork. That's why I'm sure they'll just move the Minalima's release date to March / April / May (or even traditional October) of 2023.

So what will publishers do? Because, if they release Minalima's Prisoner of Azkaban at the same time with Jim Kay's edition, sales of both the books will be negatively impacted. Jim Kay seems to have finnaly finished his illustrating and we expect the book to be published in October this year. So, I suppose that Minalima's mission was to fill the gap between publishing of Jim Kay's editions. Back then, Jim Kay was just going to illustrate the Order of the Phoenix and the publishers knew it would take him AT LEAST two years - but it took him, as we see, three (!!!) years (poor Jim!) to finish the job (the fifth book was just finally announced not long ago). I suggest that was when they decided they needed another illustrated edition to be published regularly and which would increase their sales. Obviously, 2018 was a year of poor sales for publishers, beacuse the new edition hadn't been published. You see that Jim Kay's editions were released each year, but then he needed an extra year to illustrate the Goblet of Fire since the volume of the book increased notably.

(all the books were published in October) To answer your question, let's dive into the history of illustrated Harry Potter editions:

Minalima prisoner of azkaban