The new catering area for Worlds of Fun has been name Grand Pavilion. The sign and gate is very similar to the one that was installed at Cedar Point.
Grand Pavilion is actually comprised of 2 large pavilions. The structure there in the middle is where they will have self-serve refresh stations.
The area has its own restroom facilities, which is what this building is.
It looks like there is still some work to be done on this new catering village but I imagine they will have it completed by the time group sales season begins.