With today's v5.41 patch, a new image was added to be used as the in-game icon for the previously found 'Balloons' consumable, suggesting that we may see it added as soon as next week in a content update.
Balloons (Rare)
"Rapid inflate balloons to help break your fall or soar to new heights"
As usual with leaks, no official date has been confirmed as of yet and the details (including rarity) are subject to change before release.