Guys, did you try HOTS Custom 2 from Xenox? He did great job on it, almost everything is identical from MLG build, and it is on the new map that we saw two battle reports being played at MLG(and the map is almost the same, he even did collapsible rocks).
I played only Zerg a bit, but players that tried it out against other players said that Warhounds are one of the strongest units for their cost.
Edit: Just tried Terran Mech vs. AI to see how strong it is, and I must say that I am extremely pleased. Yes, I know it was AI, but Protoss was making mass Zealots with few Stalkers and tons of Immortals(like 8 or something), and Warhounds ate those Immortals for breakfast. They are so strong, have great dps and those missiles really helps. I am looking forward to Terran mech being playable again.
I am so excited! ^^