When dying in a hardcore world and pressing the "Delete World" option, it returns you to a white background title screen complete with buttons. The menu beyond the "Singleplayer" button, like "Edit", "Create New World", and others have a dimmed background of where you died in the hardcore world.

[Update] When attempting to join a server or create a new world, you are met with a black screen, which you cannot exit without a taskkill.