Some interesting reads here if you have some time to kill:
An interview with a high ranking member form alfa Romeo stating they're studying a start in Supercars and linls BJR and GRM as likely tema candidates
https://autoaction.com.au/2017/01/13/alfas-supercar
From mid 2016 what was Ryan there to discuss performance cars or Supercars with Toyota?
https://www.google.com.au/amp/www.ca...?client=safari
And this second one an interview with the new Nissan Nismo Chief who says they should move on from the Altima and run GT-R's for Gen 2
https://www.google.com.au/amp/www.drive.com.au/amp/motor-news/nismo-chief-nissan-gtr-should-race-in-v8-supercars-20160531-gp7u3q.html?client=safari
And lastly this is confirmation that Kia are in early discussions with a team about a 2018 entry from November 2016
http://www.motoring.com.au/kia-confirms-supercar-discussions-104787/