Earlier today, Kotaku published a preview of the upcoming video game, LEGO Star Wars III: The Clone Wars. It seems that with every LEGO game that Traveler's Tales develops, they improve some aspect of the game engine and this game is no exception. An excerpt:
To deliver the experience of having multiple story lines in the game, Traveller's Tales created levels that have you hot-swapping between storylines. While you're playing one storyline, controlling a set of characters, you can see the other storyline preparing to unfold in a bubble-shaped window in the top right corner of your screen.
Shell said that during these moments, the game's AI will take over for the windowed gameplay, making sure not to die, but also not completing the task at hand. This allows players to go through both story lines simultaneously, Shell said.