There was stuff there for a 4 year old, but 75% of Innoventions is closed right now so the pickings are kind of slim. They haven't given too much in the way of details concerning the replacements.
There is a little cast member lead disaster preparedness "game" your 4 year old may have fun with. They have them find stuff needed in a disaster (flashlight, radio, batteries, etc) on a shelf and put them into the corresponding holes on the game table. It only takes 5 minutes and is right inside the door of Innoventions East if you are coming up from Spaceship Earth.