As I'm sure we're all aware, Mojang released Minecraft 1.6 today (Thursday, May 26, 2011) around 5AM EST and we've been hard at work getting a build out that is compatible with Minecraft 1.6 out. Since the release, Minecraft has seen quite a few small bugfix updates addressing some unnoticed bugs and we've pretty easily kept up with them. Unfortunately, there appear to be some issues with the update that is making the game unplayable for SMP players, so we've decided to wait for a bugfix update.

Will there be a CraftBukkit for Minecraft 1.6?
Given the reports of showstopping bugs present in 1.6, there's a high chance a new bugfix update for Minecraft will be out tomorrow or even several times this week. As a result, it is unlikely we will be releasing a Recommended Build for 1.6 until we have something stable to work with.

As a result, we recommend everyone stay on 1.5 for a while until the showstopping issues are fixed and we can get a new, stable, compatible build out.

You can already get CraftBukkit for Minecraft 1.6.4, but it is unsupported and not recommended.

I'll be scouring the internet for further reports on how Minecraft 1.6 is performing, but preliminary research and our own testing has revealed it as unplayable due to chunks sporadically loading or not loading.