(I mean, on gokunming home page today, dated 3 days ago).

"Qin is suspected of taking bribes, noting that his illicit gains would be confiscated and the suspected crimes will be transferred to the procuratorate for further investigation and prosecution."

Does this mean that those who successfully gave the bribes will also be prosecuted?

I believe it just means that the party machine did their part, and will now transfer the whole thing to real legal entities for actual investigation.

Minus things like "engaging in superstitious activities" which may be sufficient reason to kick him out of the party, but not sufficient for legal consequences.

It also means that if the party does not transfer the case, the party controlled legal system neither know nor act.