The Queen I think is the zerg's mothership, but it is used for defensive purposes mainly. There are also many different units such as the corrupter and the infestor. It looks pretty cool but knowing that ultralisks can now burrow gives the zerglings a huge upper hand. Everything can be seen in this new video.
http://news.filefront.com/whats-new-with-the-zerg-in-starcraft-ii/

You're a bit late .

Has anyone seen the infestor?

Welcome to Mar 11 2008.

yeah, everyone knew about these units at least a week ago...
i believe the infestor gives you the units it kills (?) not sure

The infestor's appearance, it utterly, terrible.

I'd post a pic if I could find one.

You mean like this?

The infestor and new queen make me wet..

In a sexual way.

Oh lord.

Riiighht....... you go do that...

anyways i like the new queen. The queen in starcraft 1 was barely used and this looks like something more useful.

Look at all those holes!