StarCraft 2: Heart of the Swarm trailer has first in-game footage

Blizzard have released a follow up to yesterday's Heart of the Swarm teaser trailer , showing the first few clips of actual in-game footage. We get to see some of the upgrade screens for the Zerg units, and more Banelings than I've ever seen in one place. Get the latest on the first StarCraft 2 expansion in our Heart of the Swarm preview.