IKEA sometimes is a diversion shopping experience, and we always goto the second level to sample the IKEA Cafe. Expect Swedish meatballs and smoked salmon; other specials might be available.
IKEA Cafe is really a cafeteria style restaurant, and serves as a nice break from shopping.
There is nothing special, except for the novelty of the IKEA Cafe. Expect cafeteria service, which means do it yourself. Really inexpensive lunch stop.