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Version: 18.104.22.16802 (Live) / 22.214.171.12493, 126.96.36.19902 (PTR)
Patch 6.1.2 was first released on the PTR as build 19728 on March 5, 2015. On March 24th, the Live realms (US) were updated to build 19802. This patch appears to be almost exclusively for implementing [WoW Token] support.