When using /data to change the block state of a falling block, the rendered block isn't updated until the block touches the ground and becomes a solid block or drops, or until the player relogs.
/summon minecraft:falling_block ~ ~ ~ {NoGravity:1b,Time:1,BlockState:{Name:"minecraft:iron_ore"}}
/data merge entity @e[type=minecraft:falling_block,limit=1,sort=nearest] {Time:1,BlockState:{Name:"minecraft:diamond_ore"}}
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Confirmed present in 1.8.1 - very well visible in this video: http://youtu.be/evPL31z44RI
Confirmed. The nbt data is updated but the client does not realise. Relogging causes them to render propperly