If both players play Time Warp off Promising Future, who takes the next turn?

Ruling: The next player (opponent) takes the next turn after the current turn ends.

Sequence:

• Both players' Time Warp spells are put into the chain via Promising Future
• The opponent's Time Warp resolves first (since Promising Future puts spells into the chain starting with the player right after the caster)
• The caster's Time Warp resolves second
• At end of turn, the game effects occur, and the last Time Warp resolved (caster's) takes effect first
• Therefore the opponent takes the next turn

Nuances:

• There is disagreement about the exact mechanism (whether it's based on effect ordering or resolution ordering)
• The card is awaiting errata and there may not be a definitively "right" way to play it currently