Jeb has released a 12wo3a per-release! Here are some new features:
New jungle biom
New leaves for the jungle biom
New bark for the jungle biom
Vines can be climbed (if there is a solid block behind them)
Mobs will spawn out of dispensers if you put a spawn egg inside

Possible features in the full release:
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Minecraft Wiki said monkeys might be added, but they deleted the page because there's not enough proof.
But it would make sense since there is a jungle biom. If they are added, I would think they can be spawned by eggs.
They might add new languages!
They might fix the slime problem in super-flat land, unless it was meant to have allot of slimes.

Hope you enjoyed this blog! Also hope Jeb releases the version soon or just more per-releases.