Minecraft wiki entry for 1.15, associated text: Bedrock Edition 1.16.0, with 1.15.0 merged into this update.
Bedrock Edition beta 1.15.0.51
Bedrock Edition beta 1.15.0.53
Bedrock Edition beta 1.15.0.54
Bedrock Edition beta 1.15.0.55
Bedrock Edition beta 1.15.0.56