They somewhat look like the Protoss. Now, the differences far outweigh the similarities but it's a thought I like to entertain.
They both have pale bluish skin tone.
They both have the same leg structures, save for the hooves.
They both have large foreheads.
They have spaceships lol.
They're also pretty religious.
What if the Draeneis are the ancestors of the Protoss? That would be awesome. In the very last patch of the very last expansion, Blizz should put a cutscene showing the link. If that crossover works, then what if the Titans are actually the Xel'Naga? Oh shi-
My life for Argus! I mean, Aiur!