New technical documentation that will help you plan for, install, and deploy Application Virtualization 4.5:

http://technet.microsoft.com/en-us/appvirtualization/cc843994.aspx

White Papers

App-V Extensibility Today Before the SDK
This white paper presents administrators with the available tools to automate common tasks in App-V 4.5, including sample scenarios and examples using the tools.
September 19, 2008
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App-V Security Best Practices
This white paper provides administrators with the starting place for designing security into the App-V infrastructure. The white paper also describes recommended security configurations available in App-V today.
September 15, 2008
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App-V Security Operations Guide
The purpose of this white paper is to provide the App-V administrator with steps to configure security settings. Some of the security settings are well-known configurations within Windows and the appropriate links will be provided.
September 15, 2008
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Creating a New Application Virtualization 4.5 Database Using SQL Scripting
This white paper explains and documents the procedure to install the Microsoft Application Virtualization Server when the administrator installing does not have “sysadmin” privileges to the SQL Server.
September 3, 2008
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Microsoft Application Virtualization (App-V) 4.5 ADM Template
This white paper was designed to provide administrators with the steps necessary to deploy configuration for the App-V client with Group Policies. The App-V Client ADM Template was created to provide administrators with the ability to centrally manage the most commonly configured App-V client settings. A working knowledge of Group Policies in Active Directory is required to implement the ADM Template to the appropriate clients, and is not described in this document.
September 3, 2008
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App-V 4.5 Infrastructure Planning and Design Guide
Use the IPD guide to maximize your organization’s time with step by step guidance to ease you through the process of planning your application virtualization infrastructure.
September 17, 2008
Read the guide online