You heard wrong, laundry is Ambitions only. In World Adventures, it adds three new places to visit, France; Egypt; and China. Each has unique fruits and fish, and it even adds some valuable gems and rocks. The skills it adds are Photography, Nectar Making, and Martial Arts. In photography, you basically capture pictures which can be sold for money; some can be sold for a couple thousand simoleons. In nectar making, you take ten fruits and mash them all up and put them in a machine that makes it into a wine-type drink. You can mix and match fruits to make a valuable combination, which can then be stored in a basement to age, and the value goes up. A martial artist trains on wooden dummies and board breakers. You can challenge other martial artists and work your way up the ladder of respect, sort of like a chess player in the base game. At each location, you can take adventures, which are special opportunities to go into tombs and such to fetch a missing item for a local. You will then receive Visa points. The Visa points determine how long you can stay at a place. At Visa level 0, you stay at a place for 3 days with a single sim (each additional sim adds 3 days) As your Visa level reaches level 3, you can stay longer and longer.
In Ambitions, it adds new jobs: a firefighter, stylist/makeover person, a ghosthunter, a private investigator, and architectural designer. In each of these jobs, you are able to control your sim at work. In some professions, like the firefighter, designer, stylist, and ghost hunter, you are "on call" for a set number of hours. When you receive a job offer (or emergency) you go to a house and give a certain room a new look, give a sim a makeover, get rid of the ghosts, or even put out a fire. The private investigator has open ended work hours. People will call you for hire, or you can search for a job to do. Ambitions also adds the new skills inventing and sculpting. Inventors will need scrap to make something completely new while sculptors can make stuff out of clay, stone, ice, and grass. There is more stuff, and Carl's guide is a great place to look into the stuff in more detail. It will also outline just about everything there is to each game, though I'm not sure if Ambitions is finished yet. You should still check it out to really get an idea of which game to get.