"The games are going to exist within these worlds," Telltale's Dan Connors told the AP. "I wouldn't call these games sequels per se but a new interpretation of their worlds for a new medium." That means we shouldn't necessarily expect to relive movie moments, but rather experience new stories within the worlds of these games. For Back to the Future, that means that all of human history is open to exploration; for Jurassic Park, it pretty much still means running away from dinosaurs.
The AP notes that both series are due to debut this winter, on the Xbox 360, PS3, Wii, PC and Mac.