Yay! We have 1.2.4 ready to go once the server restarts. Here's the kick, though... Of our plugins, I've confirmed that two of the important ones are good to go, two are in uncertain status, and one is definitely a no go. Here's the list (important plugins marked with *):
AncientGates - no go
CraftIRC - uncertain, 1.2.3
*Essentials - okay
*Multiverse - uncertain, dev build only
*PermissionsEX - okay
RocketBoots - uncertain, 1.2.3, dev build only
VoxelSniper - uncertain, 1.2.3
*WorldEdit - uncertain, dev build only
*WorldGuard - uncertain, dev build only