Twitter users AyeTSG and Lucas7yoshi have uncovered data which has revealed the path the cube will take, confirming parts of my theory.
The floating island that has Kevin the cube attached at the bottom, will be heading in the direction of the rune areas that Kevin created during the end of season 5. The path was revealed due to an exploit with Fortnite‘s replay system in which others have reported as a glitch.
Screengrab via lucas7yoshi Video
The giant whirlpool is left behind as the floating island moves on from Loot Lake taking with it the tornado which prevented you from going near the whirlpool. You are sucked up into the air that the tornado carries you to the island floating at the top
Now players are able to get close and explore the whirlpool and even jump in the middle of it. Unfortunately, there is no endless, bottomless pit but there is a layer which bounces you straight back out. It is the same bouncy stuff what the cube turned Loot Lake into when it fell into the lake.
From the datamined files, it has revealed volcano pits will spawn at the rune locations when the floating island reaches the rune areas.
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