Heroic already completed?
While some of us are still working out the mechanics, it would appear that an 80m GP guild is the first to already complete the Heroic level of Sith Triumvirate.
Forum Discussion
If you look at the raid points leaderboard for the SITH triumvirate you will see a guild on 565 points. T7 becomes available after you complete T6 so if you completed T6 you can do T7 when the guild has enough tickets.
