Minecraft wiki entry for Development_versions, associated text: TNT no longer falls through blocks when ignited. (MCPE-41313)
Using pick block on lit redstone now gives the player the correct block. (MCPE-43450)
Frosted ice no longer causes lag when it is waiting to melt underground. (MCPE-39698)
Wood blocks now have directional placement. (MCPE-43367)
Granite, diorite, and andesite can no longer be smelted into smooth stone. (MCPE-45914)
Coarse dirt is no longer replaced with dirt when a tree is grown on top. (MCPE-26215)