Here's the Bliz blog post about the trailer.
Looks pretty cool. I guess the Kerrigan story is going to come to some sort of end conclusion. I hope it explains how it goes from the end of SC2 the HOTS properly. Because I have no idea what kind of change she was meant to of went through at the end, if there was any at all.
I hate getting excited for games lol, and now that it's less than two months away from release, it's starting to creep in.