I already noticed a few strange bugs with falldamage when jumping on lifts, this was before the instance genocide started. i.e. the Great Lift in Thousand Needles or the elevators in the Undercity.
When jumping on these lifts while they are moving down the player takes damage upon landing on the lift platform. I don't remember this ever happening on retail, maybe this is somehow related?
Apparently, this bug is back with after today's PvP maintenance. Haven't encountered it myself, but a friend told me he instantly died upon entering the PvP Hall in SW