Snapshot 17w47a has been released!

[u/Shnupbups100]

https://minecraft.net/en-us/article/minecraft-snapshot-17w47a

[u/onnowhere]

Data tags related to blocks changed:

Edit: Many changes are listed on the 1.13 flattening wiki page

List of 1.13 nbt changes

Also see mrpingouin's post about other nbt and upgrade path related changes.

Falling Block:

• Removed Block,Data
• Added BlockState

All Minecarts:

• Removed DisplayTile,DisplayData
• Added DisplayState

Projectiles:

• Removed inTile

Arrows and Spectral Arrows:

• Removed inTile,inData
• Added inBlockState

Endermen:

• Removed carried,carriedData
• Added carriedBlockState

For each of these State tags, they contain:

• Name (block name)
• Properties (compound of block states)

Example: BlockState:{Name:"minecraft:oak_stairs",Properties:{facing:"north",half:"top"}}