So yeah, I have examined the videos fairly well and I have come to a conclusion, they definitely shoved their head up there on purpose. From the reaction of the crowd, their new stuff didn't go over very well.
It seems like they have completely overpowered the zerg. I love the underground light speed charge of the ultralisk, I mean it makes total sense that a creature 5 times bigger than an elephant should be able to do 90mph underground right into a battle. The cloud that reduces the range of everything in it to 1 is going to be abused to hell and back. It completely destroys the ability to use tanks on a choke point. You can ask any terran player, the terrans best strength is to turtle in and build a force because you can't instantly re-macro an army, so that cloud completely destroys the best strength.
The pull ability is the one that I am most annoyed by for one reason, it can pull massive units which is total bullshit. Fine on pulling stuff like immortals or tanks or infestors, but it should NOT be able to pull a massive unit like a Colossus. Speaking of massive units, the terrans have none now thanks to the thor numbers being reduced to 1.
The hellion transformation is going to be the single most unused item in the game. Hellions are cheap and fast, that is the whole point, no one is going to give two craps about transforming them. The shredder is also going to be abused to shit. I can just see a whole line of them across the map, for zerg it's going to be a bitch and a half.
Now on to protoss.... Ok, fine, the mothership and carriers probably aren't going to be missed. The oracle is going to be one annoying son of a bitch to deal with since it can just force field your static defenses and entomb your minerals. I can see it now, two oracles and 4 phoenix. Oracle blocks a missile turret and the phoenix shred your SCV's. On top of that, the oracle will just stay in the back of your mineral line, out of reach from ground forces and constantly stop your mining.
Heart of the swarm = everyone playing zerg because the other races now suck. Toss might be able to counter, but terran is completely and totally screwed.