WorldBorder

• Added option to Fill command which will force it to load all chunks instead of automatically skipping chunks which are already fully generated. To use this option, use a full length Fill command with "true" specified on the end to enable the option.
  Example: /wb fill 20 208 true
  or with world specified: /wb world fill 20 208 true
• Added option to kill player instead of teleporting to spawn. Option is "player-killed-bad-spawn", only available by manually editing the config file. (by rourke750 with assistance from erocs)
• Changed "Teleport cause" debug log message to remove WARNING status, as that was unnecessarily worrying some people who had debug output enabled

The option to force loading all chunks instead of skipping fully generated ones was mainly added for people wanting to follow Mojang's recommendation to load all important world chunks in Minecraft 1.6.3 - 1.6.4 before updating to the eventual 1.7 release to prevent errors with structures such as witch huts and nether fortresses. Their note regarding this is here:
https://mojang.com/2013/09/minecraft-snapshot-13w37a/