See @Amac500 's comment above and the news item reported by Jordan which states "According to comments in the live broadcast, the track and “Quick Match” mode are both set to appear in GT6 update 1.12, slated for release sometime this week."
It's not a rumour reported by a GTP member, it's mentioned in PD's live broadcast.
I quote :
According to Japanese member “BRING MORE TUNA” who also watched the stream, GT6 Update 1.12 is coming next week and will finally release the track to the public. It will also reportedly include “Quick Match” online racing features, new Vision GT cars, and a “new dashboard instrumentation option”. Stay tuned for more…
I hope he was right
Because no Japanese site as Famitsu mentions it.