FYI, MC 1.3.2 just came out. However, the 1.3.2 patch for CraftBukkit has not been released yet, so I cannot patch the server. I am not sure whether a 1.3.2 client can connect to a 1.3.1 CraftBukkit server, but it would probably be best if you did not update your clients just yet, just to be sure. If you do update and cannot connect, your only options will be to roll back your client to 1.3.1 or wait until bukkit gets patched.