There isn't a "menu" per se for brunch. It's usually an assortment of items on the buffet and then an assortment of hot items that can be ordered. The hot items include chicken parm, pizza, a fish dish (salmon I believe).
If you google Palo brunch you can find pics of the various offerings. They tend to be the same regardless of ship, depending on available ingredients in the ship's stores, so don't worry if they are from a different ship.