Spoilers for Tonight's "The Economist"

It's about Sayid. Here's everything we know:

From the ABC promo department:
Locke's hostage may be the key to getting off the island, so Sayid and Kate go in search of their fellow castaway in an attempt to negotiate a peaceful deal. Guest starring are Ken Leung as Miles, Jeremy Davies as Daniel Faraday, Rebecca Mader as Charlotte, Jeff Fahey as Frank Lapidus, Mira Furlan as Danielle Rousseau, Marsha Thomason as Naomi, Armando Pucci as Italian man and Thekla Reuten as Elsa.

The above photo is a promotional still from tonight's episode. My question: why are Charlotte and Frank together? Last we knew, Charlotte was Locke's hostage, while Frank had met up with Jack's gang. How about a clean little theory: the "hostage swap" that occurs is with the two of them. Simple enough, right? I like it - the thought of Frank getting to know Locke and Ben interests me greatly.

The last spoiler (again courtesy of EW) comes from showrunner Damon Lindelof himself:

''Well, I don't wanna give too much away, but let's just say this episode begins with a murder and ends with the first bird's-eye view of the Island in the history of the show.''