Patch 6.2.4 (undocumented changes)

This article lists all undocumented changes for patch 6.2.4. All documented changes should be listed on the main article.
==Achievements==
*A new achievement criteria was added labeled "H20 - Promo". This turned out to be for Fledgling Hero of Warcraft, which was pushed to live in a hotfix prior to the release of Patch 6.2.4 itself.
==User Interface==
*Mythic has been added to the Group Finder.
*Timewalker difficulty has been renamed to Timewalking.
*Support for Battle.net Conversations was removed, as well as the function in its entirety.
*The main login screen now also displays a list field for WoW accounts beneath the Battle.net Account Name field.
==References==
6.2.4 (undocumented changes)