Kotaku has a very small preview along with a handful of new and not-so-new screens from The Sims 3:
As a consolation, he took a sim to the town graveyard to show me another facet of the ghostly occult in Sims 3. You can send a sim into the stone mausoleum the way you would send them off to work in The Sims 2. Text options will pop up, letting you choose what your sim should do down there in the dark catacombs. Good things might happen, bad things might happen; or, he hinted, your Sim might not make it back.