Considering there's almost always at least a couple of prisma threads per week, especially around the time of new chapters, I wouldn't really say so, no.
We just had a new chapter come out two days ago.
Well, it's only really Kuro that acts like that, and it's mostly played as a joke. Most of the lewd stuff are mostly related to specials and promo art, and of course fan art/doujins.
Yeah it's pretty great, glad to see he's still doing more Illya drawings.
I do wish he would draw one of just Miyu and Illya together though.
>Lazy copy of Mashu's outfit being worn by the worst girl in Prisma.