Patch 5 . 0 . 1 Version : 5 . 0 . 1 . 15851 = Patch 5 . 0 . 1 = Blizz ard has used the patch version 5 . 0 . 1 for the , but it may not use that version for live release . The expectation will be for a pre - expansion world event release , but there is no sign of it yet on the PTR or anything but a passing mention of a Patch 4 . 4 . As of July 13th , 2012 , a blue post clarifies the use of 5 . 0 . 3 for the systems patch . On the PTR . On July 3rd , 2012 , a systems patch intended to precede the Mists of Pandaria release was announced to appear on the PTR , but will not be accessible to tester accounts and no expansion content or zones will be accessible . The first PTR systems client was released on July 13th , 2012 and had the same build 15851 number as the , but the patch version was changed to Patch 5 . 0 . 3 . Build history . Build 15464 was available on the beta server on March 22 , 2012 . Build 15508 was made available on March 29th , 2012 . Build 15544 was made available April 6th , 2012 , but there was an extended maintenance for the Beta realms most of the day . Build 15589 was released late on April 11th , 2012 after beta server maintenance . Build 15640 was released late on April 24th , 2012 and and build 15650 was released soon after on late April 27th , 2012 . Build 15657 was released on May 1st , 2012 and soon after , build 15662 was released . Build 15668 was released on May 8th , 2012 , but the 64 - bit client for Mac would not download . Build 15677 was released a couple of days later on May 10th , 2012 , but although the Mac 64 - bit client now downloads , both 64 - bit clients crash after character selection . Build 15689 was released later May 12th , 2012 and the 64 - bit client is working again . Blizz ard took a minor break to release a little game called Diablo III and released build 15699 on May 18th , 2012 . Build 15726 was released on May 23rd , 2012 . = Beta changes = Nineteenth closed beta patch . As reported by MMO Champion and Wowhead News about build 15851 : Eighteenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15799 : Seventeenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15781 : Sixteenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15762 : Fifteenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15752 : Fourteenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15739 : Thirteenth closed beta patch . As reported by Wowhead News and MMO Champion about build 15726 : Twelfth closed beta patch . As reported by MMO Champion and Wowhead News about build 15699 : Eleventh closed beta patch . As reported by MMO Champion and Wowhead News about build 15689 : Tenth closed beta patch . As reported by MMO Champion and Wowhead News about build 15677 : Ninth closed beta patch . As reported by MMO Champion and Wowhead News about build 15668 : Eighth closed beta patch . As reported by MMO Champion and Wowhead News about build 15662 : Seventh closed beta patch . As reported by MMO Champion , Wowhead News , and WoW Insider about build 15657 : Sixth closed beta patch . As reported by MMO Champion and Wowhead News about build 15650 : Fifth closed beta patch . As reported by Blizzplanet and MMO Champion about build 15640 : Fourth closed beta patch . As reported by Blizzplanet about build 15589 : Third beta patch . As reported by Blizzplanet about build 15544 : Second closed beta patch . As reported by Blizzplanet about build 15508 : First closed beta patch . Build 15464 :