So there are definitely more than 6 that come back:

Jack,Hurley,Sayeed,Kate and Aaron thus far.

PLus Ben(who probably is not famous because of his duel identities as can be seen from the passport which Sayid was looking at in the Economist) and the person in the casket,again,I think it's someone from the island who got away due to dual identities or something along those lines.

I cannot wait for the next episode. I neeeeeeeed to see something Jacob related:he is the island's biggest mystery imo because all other theories(some of which are mind blowing) explain almost everything on the island,except him. He's the anomoly and I also think he'll turn out to be very important(or at least I hope so)