The model includes upper and lower quad laser cannons, a boarding ramp that lowers, removable hull plates that reveal the main hold, rear compartment and gunnery station, and a cockpit that holds four Lego minifigs at a time. You choose the generation or mix them. It even comes with both versions of the Falcon's radar dish.
Here's a top view of the ship. There's a lot going on underneath! According to Lego, just the rear compartment "features the engine room with hyperdrive and console, two doorways, hidden floor compartment, two escape pod hatches, engineering console and an access ladder to the gunnery station."
This little fellow is a mynock, a creature that first appeared in "The Empire Strikes Back," and which can be bad news for starship captains because it likes to chew through power cables. One comes with the set, so watch out and don't let him get hungry.