WP signs up four of their Springboks after 2016

I read somewhere that  players have signed new contracts with the Stormers - but the management did not provide particulars:-
The players signed up includes Etzebeth, Malherbe and De Allende.  All three players contracts would have expired later this year.  Likely that the signing would involve a major amount iro the three players and that the revised agreement would keep them with the Stormers/WP  until 2019.
The signing up of Du Toit has only been finalized now and he is the fourth player with another  contract likely to expire in 2019.
However, there is another angle as well and that is signing up with SARU - they are all likely to be contracted by SARU as well - so their income during the next three years is likely to be circa R5 million per year.