You are wondering about this games "hub world," then; that is, it's equivalent to Gruntilda's Lair or Isle-O-Hags.
This was a highlight of those games for many of us, myself included! With their Kickstarter Playtonic promised the hub will be a large navigational puzzle, as in previous games. Much time has passed and we don't know much more than that. Fingers crossed they'll give us more info on this soon!
Here's a very early screenshot from last June-or-so:http://www.yookalayleecentral.com/wp-co ... 80x720.png