I think MrSnowGlobe was going to post something like this but I don't see him around so I will steal the spotlight ;)
Yes, 1.3.1 is out now but the servers won't be upgraded straight away. Because? Bukkit needs to update, Plugins need to update, H4X needs more TNT.
So please be patient as we go through this update as I know you guys are curious to how we will handle the new map, the old map and MrSnowGlobe's insanity.
Also keep holding your questions guys (don't bother other Staff members), H4X will tell you guys all about the plan when he is ready.
Need to downgrade to 1.2.5? You can download it from minecraft.net
Don't know what to do with the jar file?
You need to put it in your .minecraft/bin folder
Mac: /Users/H4X/Library/Application Support/minecraft/bin
Don't hit the update button inside minecraft otherwise you'll go back to 1.3!