I realize this has been posted before, but it has a confirmed release day now, and the addition of Beta access with pre-order.
This item will be released on March 12, 2013.
Ships from and sold by Amazon.com.
Beta Access for Starcraft II: Heart of the Swarm
Pre-order Starcraft II: Heart of the Swarm and get beta access. We will email your code within 4 business days after you place your pre-order for Starcraft II: Heart of the Swarm Standard or Collector’s Edition. Offers are valid when shipped and sold by Amazon.com. This offer will be extended to all existing pre-orders. Limit one per customer. Amazon reserves the right to change or terminate this promotion at any time.