AFAIK, most of the 70s have at least begun the chain. Most are in need of a Shadow Labs run. The problem we have had is we haven't had a healer to get us through running it. I am probably going to respec to holy so that I can fulfill the healing role. We will probably schedule a specific time for the run to get everybody through SL. In the meantime, if you can find a PUG group for it that's even better.
But yah, the 70s are working on attunement. You should have at least the first 2 quests done (the easy ones outside Kara).