What I was expecting to happen was:
The name of the hopper should change after renamed in anvil.
What actually happen was:
The name of the hopper didn't changed in the GUI.
Steps to reproduce:
1-Get a Hopper.
2-Rename it to something else.
3-Plonk it down.
4-Note that the name in the GUI didn't change.
Examples below
Attachments
Comments


I have found that Chests, Trapped Chests, Brewing Stands, Enchantment Tables, Dispensers, and Furnaces are the only interact-able blocks which display their new names. I've tested other blocks such as crafting tables and anvils but it didn't work. I'm not sure why it only applies to these specific blocks, but more blocks should be covered by this mechanic, at least for consistency.
Well you see, in the Crafting Table it represents as Crafting. So I think it's not good to change that, Anvils do not even have their own name in its GUI. But Hopper DO have its name on its GUI! For example: You want to change Hopper Transport #1 or #2 so it will help the map makers knowing what's what, and what's where.
Reopened.

Screenshots of 13w03a attached.
The wiki changelog says that "containers" can be renamed, which includes hoppers.