Keynote 7.1 added a new feature which called
Object List. With
Object List, you can easily select one of the objects in your slide.
Sometimes selecting an object among many objects in your slide is hard.
Object List is a solution for that situation.
View menu on the menu bar and select
Show Object List menu under it.
As you can see above, the list menu was slid from the left side between the navigator and the main canvas.
Keynote 7.1 is not a major change. But I think that Keynote 7.1 improvement is handy for all users.