original paywalled source.
there were some doubts about it
Brazilian Bureau of Institutional Security:
It is not reasonable for the country's confidential intelligence information to be passed through messaging app from a private company of a foreign nation...
TL;DR
The new system will have state encryption and WhatsApp will no longer be used for communication.
(local source: 1,2)
there were some doubts about it
Brazilian Bureau of Institutional Security: