Weighted Pressure Plate

Weighted Pressure Plates are an upcoming addition to the Pocket Edition in Update 0.13.0. Weighted Pressure Plates differ from regular Pressure Plates because a specific amount of entities is required to produce power from it.

Types
There are two types of Weighted Pressure Plates.

Light
A "light" pressure plate is the gold plate. Most mobs alone when standing on it can produce a redstone signal.

Heavy
A "heavy" pressure plate is the iron plate. It will usually take more than one entity alone to produce a power signal.