A new broom mount was previously datamined during the Patch 10.1.5 PTR, and it was originally speculated to be a new temporary Hallow's End Mount.
In this week's Patch 10.1.7 Fury Incarnate PTR build, a source for the Broom mount has been added! The new mount, now named Eve's Ghastly Rider, will be an upcoming Trading Post reward! We speculate this might be the Traveler's Log reward for the month of October, as the mount currently has no Trader's Tender cost.
NEW Eve's Ghastly Rider Description: Source: Trading Post Model id: 113768 . Read more on wowhead.com