There are quite a few new items, but it might take you a bit of searching to find them. Usually I check first on new clothes and hair styles. There aren’t many of those in
Midnight Hollow. The majority of the new stuff is for the women. There are 7 new dresses, a corset, and a mini-skirt. The men only get a few tops. They do get some hats though. Both men and women get a few new hairstyles as well, including some adorable "Steampunk Pigtails." The rest of the new items are mostly architectural details. Personally, I love the Wrought Iron Spiral staircase. I realize those are bad feng shui, but it is beautiful and I don’t think that my Sims really care about the feng shui of their houses. They’re lucky when I remember to put a roof on the house! Also you will find "new" plants. I say "new" because they are really just dark colors of a lot of existing plants, but they do make the landscape more cohesive than adding in a bunch of colored flowers would.
The Sims 3: Midnight Hollow has also added the "Savvy Seller’s Collection." This is a bit similar than the resort that you can run in Island Paradise, but a bit more granular. With this collection, you can now run your own store. It is, of course, cheaper to set up a shop in or outside your house. All you have to do is set up the rugs, shelves, and pedestals and put items on them. Make sure you are buying the Savvy Seller rugs, shelves, and pedestals. Add a shop door, so you can give your shop a name. Adding a cash register will let you set your shop hours.
If you want a commercial building, all you have to do is visit the For Lease building and set up shop. You can hire a cashier, set the store hours, set the prices, and stock the shelves with whatever you want. If you want to actually make the money from the store, you need to buy the lot though. You can choose to buy a cheaper commercial building as well. You will just need to add the shelves, etc.. Supposedly once you get this all set up and running, you can only make money; you can’t lose any. Personally, I think that the resort concept was much better set up and easier to get started on. The Savvy Seller collection is available across other worlds though, so once installed you can use those items and set up your own shop in any town you want. It’s a nice concept, but it really would have been nice to have at least a lesson or some kind of clue as to how the stuff works. I have a feeling that a whole lot more people than just me were googling "how to use savvy seller."