So it seems that the previous head of the Russian War effort in Ukraine, Surovikin
(AKA general Armageddon among Vatnik cheerleaders), has been arrested in the aftermath of the Wagner mutiny. He had *very* close ties to Wagner and was very favorable to them while he was still in charge before getting demoted. So even if he wasn't in cahoots with Prigozhin, he's now under and incredible degree of suspicion now.
I figure the arrests/purges are unlikely to stop at Surovikin. Wagner has extremely close ties with GRU, Russia's military intelligence. So I think Putin and the FSB are going to be actively looking for folks who either were actively involved, or knew about it and intentionally kept silent.