Patch 6.0.3 was first released on the beta test realms as build 19057 on October 22, 2014. On October 28, the Live realms (US) were updated to build 19085 (and on Beta) and then build 19102 (not on Beta) several hours later. Build 19103 appeared late on October 28, 2014. Build 19116 was put on Live and the Beta servers a day after the Beta ended on November 4, 2014. Build 19116 was eventually put on the PTR on November 11, 2014. Apparently the only difference between the pre-patch and expansion is a server side switch.