Honey Block

Honey is an upcoming block found in the Overworld announced for Java Edition 1.15 at MINECON Live 2019.

Usage
Honey blocks slow down the player, prevent jumping and allow slower falling adjacent to them, like going down a ladder. They also move players, mobs and adjacent honey blocks when pushed by a piston. Mobs will not be launched high in the air if a piston pushes them up, unlike the slime block's behavior.