One of the best builds that I have seen so far is from MC (who is quite honestly one of the few people I see using the new units). He jumps straight to a stargate build and pumps out an oracle. The oracle is one of the best early harassment units ever. The other thing I see people do (forgot who used it, MVP maybe), but I see people pumping out medivacs with widow mines and dropping them in people's worker lines. Hope that helps, but for the most part people are still sticking to the WoL units, especially Zerg.