Starcraft 2: Heart of the Swarm, the expansion to Blizzard's crazy famous Real Time Strategy game, is now on closed beta. With the beta now live, it only makes sense get updated on the new units. Thanks to Kotaku, here's a very quick overview of the new units.
The closed beta isn't under NDA, which means beta footage can be shown to the public. Only selected players such as pro gamers, and press currently have access to the closed beta, but Blizzard did mention that they will be rolling out beta invites very soon. If you want to join, head to your battlenet account now and opt for beta access.
If you also want live gameplay, head over to Twitch.tv to see pro players test out the changes.