For anyone using the dev build, I suggest a back up of the server. Also try updating as many plugins as you can a.s.a.p. Outdated plugins with...
I would remove it until it updates.
If you want to be %100 sure about your server safety, wait for the Recommended build.
None of the bukkit staff know 100% when the Recommended build will be finished, however if you can't wait, there is the dev build -...
Not sure, it won't kill the server because the developers wouldn't release it, but it may not be 100% compatible with a few plugins..
Your best bet is to backup your server, and put the plugins in....
http://dl.bukkit.org/downloads/craftbukkit/list/dev/ You can get the 1.3.1 dev build, but it may be unstable..
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