At least, I’m assuming they are. I didn’t actually read them, because they’re spoilers.
Anyway, according to Telltale Games’s Facebook page, you can now visit Telltale Games’s Back to the Future page, and learn what each of the individual episodes in Back to the Future: The Game is going to be about. Why you’d want to do that, I have no idea—I’m assuming that if you learn what Game 2 is going to be about, then you’ll automatically know what happens in Game 1, and so on—but it’s GameCola policy to report on everything Telltale ever does, so my hands were tied.
There’s also some new concept art, character bios, and voice clips, if you’re interested in learning more about just how good the Michael J. Fox sound-alike is.