Terry Quinn (John Locke character) said he's been told the show will reveal why he was in a wheelchair, but he can't tell when or how or anything else about it. Heck, these actors don't even really know the skinny on this show.
I found the Spoilerfix site interesting. They mention that while some spoilers are indeed spoilers, the producers and cast often put forth what they call "foilers" — deliberate false spoilers to foil the attempts of the spoilers crowd. That could be a show on its own, it seems. But, it all goes into why I characterized this article with "rumors" and "speculation" in its title. I can't guarantee any of this will happen. We'll have to watch to see what's a spoiler and what's a foiler.
Here's what I gleaned from their site, foilers and spoilers, along with my reactions:
The first episode entitled "A Tale of Two Cities" will concentrate on Jack (Matthew Fox) with flashback sequences about his drinking father and possible infidelity on the part of his wife, Sarah. Desmond will turn up at the hatch naked. Wait! I thought the hatch was done and over with according to the other spoilers! Perhaps the hatch will cringe at the sight of a dirty naked Desmond and implode. Or something. And, no, that's not a spoiler. That's just my odd mind. The premiere also focuses on Jack, Sawyer, and Kate as prisoners of the Others.
The second episode is "The Glass Ballerina" and it will mainly focus on Sun and Jin. Sayid puts Sun and Jin in danger with his plan to locate the 'captured by the Others' bunch — Jack, Sawyer, and Kate. Henry will make a proposition to Jack that Jack may find hard to turn down. A new character named Colleen is set to appear in the third episode. She's tough and seems to have military training of some sort. She distrusts most people and is only emotional when with her "significant other." Not to be confused with her significant Other. Or maybe, I don't know. Is she herself an Other? Where did she come from? Was she on the plane? I don't know.