It's a little thing, held in Adventureland where the aladdin and jasmine storytime thing was (and will be again, I hope, as I never saw that). It's a storyline told by a female archaeologist, then Indy shows up and there's a battle...kids can sit up in the front on the ground, and a couple kids are chosen to help out in the show. The show has been calmed down a bit, fewer face-punches thrown now, but even the effects coming from the cave ("of the tiger god" NOW, but used to be "of wonders" I hear) were too much for my 4 year old, who got up and found us. Parents can't sit with their kids.
Your kids might like it; it's worth seeing once I think.
But it's only a summer thing, so if you're going after summer it should be gone.