From Minecraft Wiki
September 27, 2012
12w39a is the eighth snapshot released for 1.4.2.
- Lighting system overhauled.
- Several sound tweaks
- Changed Witch texture dimensions.
- Debug screen shows which chunk the player is in, as well as where in that chunk, next to the X and Z coordinates.
5 bugs fixed
- Sound fixes:
- Fixed Witch being white for some players.
- Unlit areas (black patches) should be fixed for newly generated chunks and worlds