If updates to the official Starcraft II website aren't coming fast enough, Swedish game magazine Super Play (via Battle.net and later confirmed by a Blizzard representative) managed to glean some new information about the Terran units.As the representative said, "nothing you see here is final," and more information will be revealed in the coming months. What you do see, here, however, is an upgrade to the Terran headquarters that gives it a missile system, supply depots that can sink underground to allow passage over and a heavy aircraft that transforms into into a walking mech, among others. The scans are a bit grainy, but if you look closely at official screenshots you'll see a glimpse of few of these units.
[Via GosuGamers; thanks, Nielson]
