Weather.
This means that snowfall can occasionally happen in snow biomes, nothing in desert, and rain everywhere else. Ice and snow cover regenerates in snow biomes(maybe at the speed of grass growing on dirt). When it rains or snows, there can be a thunderstorm with lightning. During rain/snow, the sky get's darker, the sun, moon, and stars are hidden, and makes everything wet(wet may mean things such as dry farmland becoming wet farmland, but "wet" is unknown at the moment.)
Stats and Achievements are being finished.
Bug fixes(99.9% sure), but the bugs that will be fixed are unknown, at the moment.
Notch also said that if you attack while falling down, your weapons will deal +1 damage.
Water will fill into holes.
Moving backwards while being attacked reduces damage.
This update already sounds really good.
To zní opravdu mooooooc hustě!!! To bude snad prozatím nejlepší update!