Blizzard has updated the official Allied Races page with more information about Dark Iron Dwarves and Mag’har Orcs including racial traits and new screenshots of their Heritage Armor & mounts.
You can find a detailed preview of both Allied Races here.
Information about the other two Allied Races (Kul Tirans & Zandalari Trolls) are still missing and will be added in the future. Are you looking forward to any of the races? Let us know in the comments!