http://mojang.com/2013/04/its-finally-coming-minecraft-2-0/

I'm sure many of you have already seen this, but Dinnerbone has posted a teaser about the upcoming Minecraft 2.0 release, including a few pre-beta-preview videos and a work-in-progress changelog.  If you've not yet seen it, check it out - There are some exciting updates to look forward to, including...

• Super Hostile game mode
• Ultra Realistic 4D graphics
• Horses
• Hostile Chickens
• New Furnace Mechanics
• Hay Bale blocks
• Coal Blocks
• Restone Block Blocks
• Dyed Glass
• Magic, Luck, and Rainbows!
• New PvP mechanics
• Overhauled Fishing mechanics
• QUANTUM ENTANGLED REDSTONE

I'm not completely sold on the hostile chickens or changes in game mechanics, but I'm pumped about the entangled redstone, which Mojang most certainly slipped into this update as a shout-out to me 

Shhhh...

You've gotta suspend your disbelief for a moment and hope that we'll really get ponies and quantum-entangled redstone, just in case!

Hmm. Why does it seem that the horses grunt like piggies?

They ate too much and are about to explode, dropping, uh, saddles? _{I hope it's saddles, as opposed to what horses usually drop}

When MC hit 10 million sales Jeb_ confirmed horses. :D

I think he made that tweet on April 1th... so yeah, APRIL FOOLS!