There is STILL not even a development build for 1.7.
http://dl.bukkit.org/downloads/craftbukkit/
Bukkit are completely useless.
I doubt I will keep it able to warp to because keeping that in system memory will really limit the plugins we can use for 1.7, since that 1.6.4 was a massive resource increase from 1.6.2 I can’t see 1.7 being any slimmer to handle.
There will be a turnover time to break down any existing materials during the changeover before I lock building/destroying in the current world, but haven’t even looked that far yet as bukkit are taking so long!