writes "Blizzard has lifted the veil of secrecy surrounding StarCraft 2: Heart of the Swarm at a recent media event held at Blizzard HQ in California, where press were treated to a hands-on preview of the game. Gamers can expect 20 new single-player missions with Kerrigan as a playable hero, and while they're tight-lipped about multiplayer they have confirmed in a FAQ that there will be new units and maps."
Eurogamer's detailed preview
sums up the expansion's relation to Wings of Liberty
thus: "Heart of the Swarm
is still evolution rather than revolution," adding, "What they've clearly got right is the atmosphere. The hubs between missions, and the whole look of Heart of the Swarm's
interface and environment, are infused with the moist and creeping personality of the Zerg, every surface chitinous, every hole infested."