This go round, as you progress, you will begin to make modifications to the bakery and they will show up in real time between levels. There are decor additions, a new red carpet for the customers, marble counters, etc. And once the changes are made, they persist.
In addition to all of the crazy characters from the original Cake Mania, you have a few new faces. Uncle Sam is the most notable new addition. He is very impatient. "Uncle Sam Wants You ...to bake him a cake!"
Sound effects and background music remain pretty much the same as in the first game, but that's a good thing. And since you stay in the same shop, you don't have the locale change. Instead, you are remodeling one location by changing the paint color, adding new decorative items, etc.