Citizens that "mate", Redstone LAMPS... INCREASED HEIGHT LIMIT!
Now, im looking forward to the height limit increase and the lamps.. and from the video.. the 'horny' citizens is strange..
The new build height looks EPIC AND... old worlds CAN be converted to accept the height limit change!
A post from "Jeb"
...The next snapshot, and Minecraft 1.2, will automatically convert worlds to the new format. The files of the current format (“McRegion”) will remain in your save folder, if you need to restore them for some reason.