actually I didn't update the minecraft_server.jar and it's still working propperly. The client says 1.2_02 though.
I don't think Notch even released 1.2_02 server. In his twitter he only said it is a small fix for the client, so I never downloaded a new .jar. Therefore if you download a serer from minecraft.net and it is still 1.2_01, everything is fine.