This is the Brutalisk, a campaign-only unit.
This was posted on the official SC Twitter.

Isn't it too arcade?

Whoa! Now, THAT'S a boss.

It needs way bigger legs, it looks ridiculous and like it would fall over immediately, the upper body is pretty awesome though.

Just give it crazy huge spider legs with the usual claw tip and it should be good, or a longer lower body.

Of course Blizzard may never read this...

Ahahahaha it does kind of look like it needs bigger legs...

Well, insectoids are often very strong if you compare their strength to their body weight.

Just look at ants, for instance. So although it does look really weird, it doesn't mean it's silly.

This should be some fun. I Hope they have a lot of boss units in story mode. It makes for interesting play. So far we have seen Giant Zealots with Collosi Beams and then this Queen looking lurker hybrid. Awesome!

Yes insects have ridiculous strength to body weight ratios, but go compare an ant's legs to it's body size, you see it has barely anything that comes over it's knees and it's legs are proportionally quite big.

This thing would collapse or fall over forward if it leaned at all.

@Brandonsc2 What? Have there really been giant Zealots? I haven`t even hear about them... -.-
But about this "brutalisk", I think they are going to changen it, just becouse those legs look ridicilous....

Yes. http://sc2pod.com/forum/viewtopic.php?p=12016#p12016
I dubbed them "Colossal Zealots" for obvious reasons.
Yeah, the Brutalisk does look a bit too unbelievable. I wouldn't be surprised if this model isn't what we see in the release.

it needs a smaller body, bigger legs and claws

it needs a smaller body, bigger legs and claws

Hey, wait a minute....look next to that Brutalisk (right), you can see another huge shadow and on the left u can see something.......huge too....what are those things?

ok what YOU pic that or OMEGAlisk? Why doe omega have lisk in it like hdrya lisk

hey your right those thing are like tentclaes and not part of ZERG !@#@$?