The official SQL Server AlwaysOn team blog.
Microsoft SQL Server AlwaysOn Solutions Guide for High Availability and Disaster Recovery
Summary: This white paper discusses how to reduce planned and unplanned downtime, maximize application availability, and provide data protection using SQL Server 2012 AlwaysOn high availability and disaster recovery solutions.A key goal of this paper is to establish a common context for related discussions between business stakeholders, technical decision makers, system architects, infrastructure engineers, and database administrators.The content is presented in two major parts:
High Availability and Disaster Recovery Concepts. Provide a brief discussion of the drivers and challenges of planning, managing, and measuring the business objectives of a highly available database environment. This discussion is followed by a brief overview of the high availability and disaster recovery capabilities of SQL Server 2012 AlwaysOn and Windows Server solutions.
SQL Server AlwaysOn Layers of Protection. Provide a deeper discussion of the feature capabilities, rationale, and dependencies of the layers of protection offered by a SQL Server AlwaysOn solution. It will cover infrastructure availability, SQL Server instance-level protection, database-level protection, and data tier application capabilities.
This is an excellent article, however, it fails to mention all of the replication options available for multisite clusters. In addition to array based replication, host based replication solutions with cluster integration from companies such as SIOS, DoubleTake and Symantec are also viable options when looking for cluster replication options.
For more details on SQL Server Reporting Services and AlwaysOn, see the following topic