This illustration was released to commemorate the upcoming 7th KyoAni Exhibition. Check out the AC article for additional information. Most relevant for this coming Summer season is one of the characters featured is from the about-to-premiere City the Animation. Synopsis from AniList:

This town, is not just a normal town.
There's laughter, love and emotional moments.
An unpredictable ordinary life presented by the residents.
Exciting stuffs come one after another. Welcome to CITY.