Badass. Very nice quality.
I don't know if you've seen it already or not, but
this thread might help you a little bit for the scale of the units and battles.
Not necessary of course, but I feel like it would simply be that much better if the Ultralisks were giant, hulking monstrosities, instead of Hydralisk sized (as seen in the opening shot. It's also worth noting that Immortals are supposed to be a ways larger as well). I see that the Ultra is much larger in a later shot, but consistency is key

The queen is also a teensy bit small.
Aside from the minor sizing issue (which is perfectly excusable, and I'm pretty sure most people don't care that much), it's great. However, I would love to hop on board as an editor (sound or otherwise). Most of the protoss voices are good, but I think I have something that can throw a little bit of flair onto them when I get to my desktop (2 weeks).