6 minutes ago, Derpzilla88 said:My first guess to why there's a Palpatine laugh: Rey has a force vision of Palpatine/Palpatine's spirit when she goes to the crashed ruin of the Death Star II.
That is pretty possible. In Shattered Empire when Leia went to Naboo she could feel the presence of hatred Maul left there. So for a powerful force user like palp in his grave...
Might also have a chance for Anakin to show up.