Diamonds aren't actually forever, not unless you cast a Durability enchantment.
You can download the new development snapshot from Mojang's site here, but it you've never tried installing a new snapshot before then I'd recommend you have a look at our how-to guide first.
As well as those mentioned above, there's a host of other changes that have been made. Here's a (not exhaustive) list taken from reddit at around 2:30pm today:
- Added enchanted books to villager trading and loot chests.
- Added tool highlight when switching items in the hotbar.
- Added a warning for users playing Minecraft on systems that won't be supported for much longer. (PowerPCs and Java 5.)
- Dropping items while sneaking now drops the entire stack.
- Death messages now appear in server log files.
- You can now use Written books to enchant any item in Creative mode.
- Expanded on enchanted books:
- They can now be found in dungeons with special enchants normally not obtainable.
- Silk Touch can now be applied to shears on the anvil, cobweb can be harvested this way.
- They can now be found in loot chests and by trading with villagers.
- Unbreaking can now be applied to anything with durability.
There's a whole bunch of other bug fixes, too:
- Fixed the Firework Star crafting recipe consuming unneeeded items.
- Fixed enchanted books allowing enchants to be applied to items that shouldn't receive them.
- Arrows shot at Endermen should no longer disappear.
- Fixed a bug with custom mob spawners not spawning different types of entities correctly.
- Fixed animals appearing to walk through fences in single-player.
- Fixed some items with multi-layer textures rendering both layers separately when on the ground.
- Fixed tools differing only in damage not being able to be swapped in the inventory.
- Fixed some Z-Fighting with the beacon.
- Fixed some graphical issues in the trading GUI.
- Fixed /say not showing the text in the original purple color.
- Fixed placing double slabs ignoring damage value.
- Fixed minecarts being unable to travel through Nether portals.
- Fixed lightning not flashing.
- Fixed firework star duplication crafting recipe.
- Fixed the Nether and the End generating random client-side blocks in MP.
- Fixed FallingSand spawners failing to save properly and causing crashes.
- Fixed the blocks in lowest layer of the map not being recognized by beacons.
- Fixed enchants not showing up in item frames.
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itsreally commented on The PC and Mac version of Minecraft has sold ten million copies (and horses are coming)