I seem to have misread the announcement. There was a large ad put up by dengeki comics at the station near Anime Japan for a number of their comics saying they're looking for offers for anime projects for them. Since lots of people in the industry were going to Anime Japan.
Mitsubochi Colors was on the list with Gabriel Dropout. The source of my confusion, since I didn't stop to read it carefully, was kono bijutsubu ni mondai ga aru being in the group, which actually does have an anime starting in July. I must have confused the July text as applying to all of them.
I can't be sure how serious the sign was; if it's just meant to be a funny ad or if you can imply they really are pushing for anime adaptations of those.