Here we look at the 12w07b snapshot, which updated the following -

-Added new world file format called "Anvil" (256 max height and 4096 block IDs*)
-Multi-player light calculations do no longer cause affected blocks to be transmitted to the clients, instead the clients will recalculate the light on their own
-Villagers will repopulate villages based on how many houses there are available
-Some nights in villages will be worse than others...
-Added a redstone-controlled light source
-Decreased chance for the rare mob drops
-All animals use the new AI system now

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