https://mojang.com/2015/08/minecraft-snapshot-15w33a/
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Update: Snapshot 15w33b has been released to fix some nasty bugs, as follows:
[Bug MC-85837] – Crash or chunk corruption on turning "text" into
Components
[Bug MC-85839] – Crashing when summoning a mob
[Bug MC-85884] – Lingering potion shows incorrect time values
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Roar! That’s dragon for “Greetings, human. I like your face. Here’s a
snapshot“.
This week’s snapshot brings a whole new type of potion, some smaller changes
to existing potions, more changes to the Dragon fight mechanics (there’s a
reason to respawn her now, and I do not apologize for making it so much
harder), and a bunch of optimisations/bug fixes.
I would like to take this opportunity to remind people that we have not yet
balanced the new (or existing) features. Things will either be completely
overpowered or hilariously underpowered, so keep that in mind when playing
with any new stuff!
Here are some of the notable changes:
Added new ‘lingering’ class of potions.
Told the dragon that you all called her funny names, so now she’s extra
angry.
Optimisations! Bug fixes!
Looking into End Gateways may cause slight headaches.
Recalibrated the quantum intake regulator.
Searge also requested that you all know the following. I suspect he’s
moonlighting as a litter pick.
It will be noticed if you throw your trash everywhere
It will also be noticed if you pick it up and keep your world clean
And these are some of the fixed bugs:
[Bug MC-82945] – UUID error: Tried to add entity with duplicate UUID spam
[Bug MC-83350] – Entities teleporting through a portal disappear instead
of teleporting.
[Bug MC-83731] – Using /kill on the Ender Dragon doesn't end the fight
[Bug MC-85288] – "Save World" and "Cancel" Button have been switched
[Bug MC-85382] – Attempting to use a spawn egg on a block thats out of
range throws error
[Bug MC-85397] – Adult mobs spawned with mob eggs are "invalid", they
can't be selected with @e
[Bug MC-85542] – Enderdragon can destroy end_portal and end_gateway
blocks