It remains to be seen how far the TV series will pursue those questions. The first 17-odd minutes of the premiere are available now on Hulu (and embedded below), and they focus on the chaos that results when there's nobody at the wheel of the world for two minutes. (The opening scene of Lost, with its confusion of noise and puzzling images, is an obvious inspiration.) One big difference is apparent: in the novel, we (basically) know the cause of the visions immediately, and the main characters are the physicists who (basically) caused it. But the TV series makes the cause a mystery, and has a cast of prime-time hero-types (FBI agents, doctors) who will, it seems, spend the first season piecing together the puzzle. Regardless of how the show treats its philosophical underpinnings, it's heartening to see an idea-driven work of SF like Flashforward brought to a broader audience. (Now, if only NBC would pick up Calculating God...)
Read more about Flashforward (the book) in chapter 4 of The Gospel According to Science Fiction.
Tangentially: The cast of FlashForward includes Irish actor Brían F. O'Byrne, an absolutely amazing performer who never seems to get a fair shake in the movies. He originated the role of Father Flynn, the priest at the center of John Patrick Shanley's play Doubt. Philip Seymour Hoffman played the role in the movie (which I reviewed here), and though he's good, it was better on Broadway. O'Byrne has had a lot of bit parts as priests, perhaps most notably in Million Dollar Baby. (Someday I'll write something about the scenes between Eastwood and O'Byrne in that movie; they mark one of the most intriguing portraits of faith in Eastwood's career.) I have no idea what role he's playing here-- he doesn't appear in the preview-- but he's a truly great actor, and hopefully the longer format of a prime time TV show will give him the screentime he deserves.