Age of Empires II HD Patch v2.6 (c) Microsoft Studios
    
        07/2013 :..... RELEASE.DATE .. PROTECTION .......: Steam+CEG
              - :.......... DISC(S) .. GAME.TYPE ........: Strategy
   
                   Üßß  ÜßßÜ ÜßÜßÜ Üßß  ß ÜßßÜ ÜßßÜ ÜßßÜ Üß
  ßßßßßßßßßßßßßßßß Û ß² Ûßß² Û   ² ²ß Ü Û Û  ² ²ß   Û  ² ßßßÛ ßßßßßßßßßßßßßßßß
                    ßß  ß    ß   ß ßßßß ß ß    ß     ßß   ßß
  Note:
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  Only the initial release is required to use this update.
  
  Check out the included text file for a list of what's new.

2.6 Updates
Mayans have their eagle warrior back (instead of a scout cavalry).
Detailed ELO information can be displayed in the main menu while in the multiplayer section. You can mouse over it for even more detailed information. 
ELO rankings now show up in the lobbies, and update appropriately depending on mode.
Whenever you complete a match, you will get details about how your ELO rankings were effected. It will also detail reasons why ELO rankings wouldn't have changed too, such as playing a game containing AIs, or aborting a match before the time limit elapsed.
The Steam Overlay should no longer interfere with frame rate issues.
Games will not effect ELO until the game has been played for 90 seconds. This has been reduced from 5 minutes in RM and 2 minutes in DM. Both modes are now 90 seconds based on game speed (i.e. 'fast' is 2.0 speed, so actual time is 45 seconds)
History screen now plays correct sounds for each of the civs.
In game event notifications for finding sheep, completing research, etc., are showing up again.

Known Issues
The main menu ELO stats only calculate when you enter the multiplayer screen. If the stats appear incorrect, leave the menu and re-enter the menu and they should update. It can take a few seconds to retrieve them from Steam after starting a game or updating scores at the end of a match.
There could be some overlap issues in the lobby screen to make room for the ELO, especially in some of the foreign languages. 
If you quit a game (vs resigning), you will not receive the popup message detailing any ELO changes.