The title says it all...

It turnes out that the server will be down for about a week while they do their migrations.

As part of our ongoing effort to ensure our customers receive the best possible service from Multiplay, we will be changing the operating system behind your service.

This is the first step for us to begin bringing you exclusive all-new Minecraft only features for your service in the coming months.

Unfortunately, this means that you will experience a small outage whilst we perform this migration. Other than this downtime, you will not experience any change in your service.

Your IP address, current server configuration, world data and all associated backups will all be retained. Any voice comms services you have as part of your Minecraft subscription will also be unaffected.

This is a direct quote from an email I recieved from Multiplay

Minecraft Server Updates
Apr 20 2011 15:53:15 by Slanty
We are aware that there have been server updates for Minecraft. We have had reports of major bugs with the 1.5_01 release and that there are still some problems in 1.5_02. We are going to wait to see if the servers are patched a third time.

If this update is suitable to be rolled out we will do so as soon as possible. Our apologies for any inconvenience this causes.

This is copy/pasted from the Multiplay Clanforge news.

All right everyone! Preperations have been made. The server will be down for a short amount of time when Bukkit 1.4 is added to the server providers support capabilities. There will be a completely new world I have already imported from Single Player (it's a fresh seed.) I have shown a few select people what we will be working with, and so far they all like it, and I hope you all will too.

Just a heads up for a nearby unestablished date.