"Duran said it would make no difference, because he had seeded the Hybrid on many worlds"

I think this means that its the same type on different worlds...

Weyu > 'Well just becouse there are three playable races doesnt that mean that we wont see new races that are in the campaigns.'

That could be possible. But then Blizzard has to spend ages balancing them and I think they won't do that. We can still hope though...