(Sorry HordePrime for stealing your gig!)
First major thing - cooking! Now when you click on a stove you have two options. Baking and cooking. Baking brings up the menu we are all familiar with but selecting cooking gives you access (after completing the Bread Winner quest) to the cooking hobby and the items you need to cook to complete it.
After cooking an item you click on the bubble above your sim's head and your sim places a plate on a nearby available surface (if there is no available surface your sim will place the plate on the floor). Clicking on the plate gives the options to "grab a meal" for 10 minutes; "clean up" for 13 secs; or "call to meal" which calls all sims in the house to "grab a plate" at the same time. The sims sit down and eat a meal, with the plate, and food. When they are done an dirty plate remains and has to be "cleaned up".
Here is FM's guide about the new cooking hobby
EDIT - Compilation of info and changes so far (I will add to this)
- - babies are cheaper
- Ultimate Make Over (able to change sim's name, gender, and skin tone)
- new 'Lucky Spin' set up for hobbies
- clothes! (if you started playing in October or later these clothes will be new to you but for people who had been playing before then - we get out clothes back!)
- new cooking hobby (reward for completing the grid - Cutting Boards)
- there is a glitch with the weather machine - on the snow setting the snow falls but there is no snow on the ground
- new Progressive Computer (§700 after first free one) and Progressive Poster (free)
- the Mysterious Top in the Carnival is still a mystery
- the cooking menu can be accessed by tapping on any chopping board, fridge, stove, microwave and toaster
- Seniors are now able to fish
- unable to zoom out as far (doesn't seem to affect iPad users?)