Lost: "The Beginning Of The End"

And now it all starts to pay off.
Before this fourth season is over, Lost is bound to disappoint we fans again; and if it gets to the end of the planned 16 episodes, it'll probably win us back. Since shows like Lost usually start shooting each season with only a handful of scripts finished, constant tweaks and adjustments are made on the fly, so inevitably the seasons contain some dead ends and padding. With a show that has a mythology as complex as Lost's, viewers are bound to feel those bumps more intensely. If we weren't all so invested in where this story's going, we likely wouldn't care so much when the writers test our patience with a detour.
Tonight's episode though–like last season's stunning finale–was nearly all forward motion. We picked up where we left off last May, with the survivors of the crash of Oceanic flight 815 divided into two camps, each awaiting the details of their imminent rescue. Up by the radio tower, reluctant leader Jack has just signaled a nearby ship, to the dismay of The Others' messianic leader Ben, and to the relief of mysterious visitor Naomi, who's bleeding from a knife-wound delivered by the ever-mercurial castaway Locke. Meanwhile, down on the beach, Hurley has rescued Sayid and Bernard–killing a few Others in the process–and has received word from Jack that their transportation off the island is on its way. Which would be all well and good, except that within minutes of Hurley's victory celebration, the cynical seer Desmond rows his boat ashore, carrying the news that doomed, impish alt-rocker Charlie is dead and that the coming rescuers may not be who they seem.
The rest of the island action this episode was more about moving the players into position on the board rather than resolving anything. There were really only two major moments: In the middle, Hurley stumbled upon the cabin where Locke once met Jacob, the soul of the island, and Hurley glimpsed a shadowy figure inside who resembled…whom? (Last season I could've sworn "Jacob" was a future version of Locke; but tonight he looked more like Jack's dad, Christian.) And at the end, a helicopter descended, and creepy Jeremy Davies (playing a character as-yet-unnamed), looked at our hero and said, "You're Jack, right?"
There was far more bustle this week off the island and in the future (or is it our present?). Hurley, haunted by visions of Charlie, crashed his Camaro and got himself re-committed to a mental institution, where he was visited by a shadowy man in black (played by The Wire's Lance Reddick) who claimed, probably falsely, to be a representative of Oceanic Airways. Later, Hurley also got a visit from our man Jack, who flashed a phony grin and tried to figure out if Hurley had spilled any of the secrets about how they got off the island, and what happened back there.
What did happen back there? Who are the rest of "The Oceanic Six" that Hurley claimed to be a part of? (We know Jack's one; and probably Kate, because we saw her in the present day back at the end of Season Three. What about the unnamed man in the coffin from that S3 finale?) And how long will we have to wait to find out the answers to these new, undeniably provocative questions?
I'm not especially concerned with the last point at the moment, though it's worth noting that this show has a bad history of introducing new mysteries to distract us from the old ones it hasn't solved. Still, Lost's steps have been so sure-footed of late–both at the end of last season and the start of this new one–that I'm willing to indulge the addition of new characters and new unknowns.