Update for 1.4. Please note this is really messed and doesn't seem to work.

pom.xml

@@ -74,7 +74,7 @@
         <dependency>
             <groupId>net.md-5</groupId>
             <artifactId>mendax</artifactId>
-            <version>1.3-SNAPSHOT</version>
+            <version>1.4.2-SNAPSHOT</version>
         </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>

src/main/java/net/md_5/bungee/Configuration.java

@@ -54,6 +54,14 @@ public class Configuration
      * Server ping motd.
      */
     public String motd = "BungeeCord Proxy Instance";
+    /**
+     * Server protocol version.
+     */
+    public int protcolVersion = 47;
+    /**
+     * Server game version.
+     */
+    public String gameVersion = "1.4.2";
     /**
      * Name of default server.
      */

src/main/java/net/md_5/bungee/InitialHandler.java

@@ -77,7 +77,13 @@ public class InitialHandler implements Runnable
                     userCon.connect(BungeeCord.instance.config.getServer(handshake.username, handshake.host));
                     break;
                 case 0xFE:
-                    throw new KickException(BungeeCord.instance.config.motd + ChatColor.COLOR_CHAR + BungeeCord.instance.connections.size() + ChatColor.COLOR_CHAR + BungeeCord.instance.config.maxPlayers);
+                    Configuration conf = BungeeCord.instance.config;
+                    throw new KickException(ChatColor.COLOR_CHAR + "1"
+                            + "\00" + conf.protcolVersion
+                            + "\00" + conf.gameVersion
+                            + "\00" + conf.motd
+                            + "\00" + BungeeCord.instance.connections.size()
+                            + "\00" + conf.maxPlayers);
                 default:
                     throw new IllegalArgumentException("Wasn't ready for packet id " + Util.hex(id));
             }