zerging rush don't work all the time, Zrush is more like playing poker sometimes (assuming that you don't use map hack), cause you don't know what your enemy have. If your enemy is a good player, there is so many ways around it and even turn the table on you.
Anyways, here is something that you might see in SC2 They are from the SCG, but I guess this is why they said "you can't have SCG without screwing/spoiling SC2" :
Spoiler for :
Mecha Overlord of the new race?
I hope the range type zealots maded in the SC2.
11 days left till moment of truth