So.
TschVK Wagner's camp got attacked with rockets by the Armed Forces of the Russian Federation (VSRF/AFRF/RAF whatever) on behalf of Shoigu Minister of Defence and Gerasimov Chief of the General Staff, both staying in Rostov.
This wasn't the first attack, earlier that drunk lieutenant colonel opened fire on them, and perhaps there was another before that. Furthermore Prigozhin continuously complained about the treatment Wagner got, for example the lack of support, ammo provided by the Russian MoD.
After the attack I have no doubt the top ranking members of the TschVK discussed what to do about it, what are their options, possibilities and outlooks about the future. I do not believe the further steps was initiated by Prigozhin alone. I also think they already have the thoughts going for months now, and they also have the agreement of the lower ranks. Since they let the prisoners go, they only have the crew who signed up entirely volunteerly. However many guys are probably new in the sense that they were not there in earlier contracts. But the roles in officers and all key positions are held by old veterans, brothers in arms and crime.
So now they decided to occupy the command and control center in Rostov, it seems they have Gerasimov, but Shoigu fled by helicopter. Now they are on the move to north, to Moscow it seems. At this point they had some action in Voronezh and perhaps they also take over the command and control center. At least there are some news about this.
Other tidbits:
Prigozhin said >>50513 they are 25.000 strong.
Prigozhin did not verbally attacked Putin.
Gen. Surovikin (commander of the spec. mil. operation) warned Wagner to follow the commands the supreme Commander in Chief (Putin).