StarCraft II: Heart of the Swarm Multiplayer Video and New Units

Blizzard  Entertainment has revealed some of the multiplayer units for their futuristic strategy expansion pack StarCraft II: Heart of the Swarm and a new multiplayer video has been unveiled as well. The expansion will focus on the Zerg and Sarah Kerrigan‘s storyline, which will eventually provide more closure to the StarCraft universe leading up to the final expansion pack, Legacy of the Void.

Check out the new units revealed for each faction below.

Zerg:
Units:
Swarm Host - Intended as a Zerg artillery unit, the Swarm Host continuously fires swarms of locusts at both land and air units.
Viper: This is being called a “battlefield manipulation unit” with two new abilities. The first is called Abduct and allows it to snare and draw units toward it. The second is called Blinding Cloud and creates a zero visibility environment in which range is reduced to zero.

Abilities:
Ultralisk - may now burrow underground and charge forward for quick attacks.
Hydralisk - speed boost while close to the hive, allows zerg to be more mobile.

Protoss:
Units:
Oracle - Harrassment unit which can use an ability called “entomb” to prevent enemy resources from being mined. Can cloak nearby enemies and buildings. Can also cast “preordain” on enemy or building to gain detection against cloak.
Mothership Core - Available immediately. Can transform into mothership later. Teleports to any nexus, and can use “purify” to defend base. Can also give energy to units, and recall units to the base.
Tempest - Capital ship that targets one enemy at a time unlike the Carrier. Blizz is reportedly considering an upgrade that would make its range enormous. Nearly twice the range of a siege tank.

Terran:
Units:
Battle Hellion - Can transform into either a speedy, lightweight form or a hefty tank-like form.
Warhound - Designed as an anti-vehicle unit, the warhound has two attacks: a cannon which targets anything, and missiles that automatically target vehicles. This will be the first time Blizz has used auto-target in StarCraft.
Widow mine - Burrows into the ground, then attaches itself to a passing enemy. Explodes for 200 damage + splash damage after 10 seconds. Will not explode if attached unit dies.

Abilities/Upgrades:
Reapers - No longer have bombs when targeting buildings. Instead, now reapers can recharge health when not in combat. Blizzard hopes this makes them more viable as scouts.
Battlecruiser - Experimenting with a speed boost ability. Not final.

Currently, no release date for the expansion pack has been announced but, it has been speculated to release in 2012 itself.