http://kotaku.com/5966772/minecraft-15-update-features-cool-things-like-creeper+shaped-fireworks-and-more
Yeah, fireworks is kinda cool, we'll be able to put together an actual fireworks display, with the ability to have it explode in small balls, large balls, stars, or creeper faces, and you can also add popcorn crackling or streamer trails. The colours can be changed with dyes, and one firework can hold up to three different explosive charges (called "firework stars"). On the one hand it doesn't serve any purpose in the game, on the other hand I can totally see groups of friends getting together for giant fireworks displays in-game...
Darn good thing its running on a quad core xeon sandybridge cpu at 3.2Ghz, and 16GB ram.
YOU CAN STORE ENCHANTMENTS IN BOOKS
FINALLY
I mean, you gear up your junk and then what you gain a bunch of useless levels to the cap but now you can put those levels to work in books!
Very clever!