Check out this picture...
http://www.sc2blog.com/wp-content/up..._screen002.jpg
Notice where the marines are, there are these other Protoss units (they are uncolored, default blue), and they seem to be doing melee attacks to the marines? There are Soul Hunters there which are blue as well, but look near the marines. There seem to be a different unit there.

The psionic blades look rough, kind of like claws! They look like Templars maybe, but why would they be doing Melee attacks? Could this be a Zerg / Protoss hybrid?

Also, check out the twin cannon Terran units!