Hurley has a gun, which I think Sayid gives him in the mental home right after what we saw of their conversation at the end of Season 4. Sayid is seen battering someone in a kitchen, before Hurley is dragging someone away. Double team between Sayid Bourne and Hurley? Who the chuff is Sayid hitting? It looks like Jin to me.
Daniel Faraday (tie-wearer of the year) seems to be on the way into a hatch, and it seems like the big vertical entrance to the Swan. He's also seen in a Dharma helmet exploring what looks like a cave. Juliet also seems to be discovering a hatch-like door. I think Faraday is funny as fuck, his mannerisms are nuts, he reacts to people like he's been asked impossible questions all the time.
Sun is holed up in a British police station, then someone cocks the gun on her from behind, oo-er.
Kate grabs Aaron and they go off on holiday (he's a little young to be doing her on-the-run hobby though surely, heh)
Jack looks his usual self. Fucked off.
The strangest thing for me however, was the plane falling down the drop again. The same plane that first fell like that onto open ground in Season 1, helping hurt Boone and uncover the spying Hatch. Why would we see that happen again? Because the island moved in time thanks to legendary Ben the Badger, badgering around at Season 4's end. And we'll see more things happening in S5 that did in S1. Or so I reckon anyway.
The Oceanic Six may return via plane crash who knows.