I wonder if this is streamed on GT1World after all... qualifying and superpole streams are already listed, but the race isn't (unrelated GT4 and GT Asia events on Sunday are still listed and usuallly all Blancpain events are listed beforehand, so by all accounts this race should be listed by now too).
Qualifying:
https://www.youtube.com/watch?v=2WIURco6VJI
Superpole:
https://www.youtube.com/watch?v=jxy3cKCbo4U
Another worrying thing is that everytime CBS Sports showed a Pirelli WC race (whether live or tape-delayed), there was no live stream for that race.