Steps to reproduce
Open up the F3 debug screen
Look at a block that has a data value (for example: stone variants, dirt variants, different colours of wool, glass, clay... or various rotations of chests, signs, etc...)
Look at the right hand side of your F3 debug screen, after the ID
No data value. I can assure you there was one before (many snapshots ago) but then the hideous square brackets '[ ]' came after the ID and the data value was removed. Later they removed the horrible '[ ]' but the data value has not come back.
This is a real problem because i benefited greatly from being able to know the data value of a specific state of a block when using /setblock or /give.
WAI. MC-64187