1.8 is coming in about 2 days =D

We will have to wait for CraftBukkit & plugins to catch up anyway. I will most likely set up a separate world for 1.8, but this is only going to happen once the server runs 1.8 itself. Also, the new world will probably be the 'main' one.

While waiting for Bukkit to catch up, *maybe* there will be a vanilla 1.8 sandbox. The data and structures will not be moved to the main map, however.