Unfortunately, I doubt we would get this but it could be interesting and fun. I would expect drama. I want fights at will readings and, of course, someone jumping into the grave as a prank or in grief-striken hysteria. Fights at the viewing. Someone could steal flowers from the graves and sell them. the funeral director can repossess items from a household that doesn't pay off the bill for a loved one's funeral. It could tie into occult gameplay as well, with Vampires rising from the grave/casket, and Vampire Hunters lurking around suspect graves, stakes at the ready. If they wanted to get really gruesome they could have dogs and werewolves digging up graves and dashing off with bones...no, that would never happen in this game. >:)
Bonus if they made the coffin/casket a Woohoo spot. I don't suppose they'd let the sims do that in a coffin that was in use, but imagine the dramatic possibilities! "How dare you woohoo in grandpa's coffin - he wasn't even buried yet!"