Well... I don't say that Blood Elves wouldn't be a nice race to have (Actually, their campaign in WC3 is my favorite) but it would be like a repetition of the Alliance.
Iron Dwarves are more a subrace of dwarves than a Clan... don't mix them up with the Dark Iron Dwarves... But more dwarves in game, the more I would like it.
And there is a loooooooong distance between Draenei and Eredar... They all started as the same race and culture, but the Eredar were corrupted by Sargeras and granted inmense power, which made them grew horns, turn into a red-purple colour and become real giants. If the Eredar come in as a new race, they would be actually the Burning Legion itself, as the Eredar are the commanders of it. (Archimonde and Kil'jaeden are Eredar, remember?)
Iron Dwarves are more a subrace of dwarves than a Clan... don't mix them up with the Dark Iron Dwarves... But more dwarves in game, the more I would like it.
And there is a loooooooong distance between Draenei and Eredar... They all started as the same race and culture, but the Eredar were corrupted by Sargeras and granted inmense power, which made them grew horns, turn into a red-purple colour and become real giants. If the Eredar come in as a new race, they would be actually the Burning Legion itself, as the Eredar are the commanders of it. (Archimonde and Kil'jaeden are Eredar, remember?)