Orgrimmar Interceptor is one of the BlizzCon 2017 special (virtual) items. It is available both to BlizzCon ticket holders and to those who purchase BlizzCon Virtual Tickets.
This is a flying mount and its flying speed depends on the riding skill of the character using it.
It includes a passenger seat, so it is able to carry two characters.
The /mountspecial is the interceptor visually moving back a couple feet, charging and firing the wolfhead cannon.
Orgrimmar Interceptor is one of the BlizzCon 2017 special (virtual) items. It is available both to BlizzCon ticket holders and to those who purchase BlizzCon Virtual Tickets.
The Alliance counterpart is
Stormwind Skychaser.
Official video from Blizzard: