I'm guessing 1970's. The plane flew into the bubble and Jack, Kate and Hurley got caught in a flash (for some reason) and went back to 1977. So I imagine that Locke, Lapidus and the other survivors from the Ajira plane crash who didn't flash are on the island around 2007. (Since the Hydra station has been abandoned by the Others rather than being in full swing and full of Dharma folks in the 70's.) How they all reconnect, I don't know just yet. But did Sun flash as well, or did she take the outrigger with Lapidus in 2007 to go look for Jin on the main island?
At this point, I'm really not seeing why the Oceanic Six had to return. The time flashes stopped when Locke turned the wheel, and it looks like their return wasn't actually needed to save the lives of those left behind. I really don't know where they're going to go from here.
And what happened to Rose and Bernard? Did they end up with the Others? They have to explain where they've been for three years.
But it was nice to see a successful childbirth on the island. Now I am wondering about the identity of Amy and Horace's son. (Also, what happened to his previous female companion?) I'm sure that when they reveal his name, it will be familiar to us.
Oh, and the four toed statue cameo was fun. My wife says that it came from Tunis.