The PIC is trying to block the Guptas' bid to take a stake at Independent Newspapers, which seems to indicate a hardening attitude towards the family.
The Guptas are now legally fighting for a large stake in Independent Media due to a 2012 pact made between them and the company's chair, Iqbal Surve.
An oil deal originally fronted by Khulubuse Zuma is being probed by US authorities as part of a wider investigation into Och-Ziff Capital Management.
The Panama Papers leak has thrown light on ownership secrecy in a Khulubuse Zuma-fronted oil deal in the Democratic Republic of Congo.
Sars has threatened to sue the M&G over the publishing of an amaBhungane story that lawyers say was "clearly in the public interest" and "lawful".