With all the changes with haste and haste breakpoints for Warlords of Draenor, Blizzard answered some questions about how haste will affect Paly’s Eternal Flame and Sacred Shield in WoD.
With all the changes to haste breakpoints in Warlords, will Eternal Flame and Sacred Shield continue to work as on live?
Eternal Flame is a HoT like any other, so the changes apply. Sacred Shield is unusual; intend will be the same, may be custom. (Source)
So Eternal Flame will be affected by haste changes, but we could still see some changes made to Sacred Shield before the expansion drops.