http://www.microsoft.com/presspass/features/2006/oct06/10-17Desktop.mspx
Beginning in January 2007, we plan to offer the optimization pack worldwide as an add-on subscription for companies with Software Assurance agreements. Customers with Open Value, Select, Enterprise Agreement (EA), EA Subscription and Campus and School agreements can subscribe through volume licensing, for an estimated retail price of US$10 a year per desktop.

FYI: SoftGrid is available in a perpetual license standalone today outside of volume licensing, however SoftGrid for Windows Desktops will only be available in Microsoft Desktop Optimization Pack for Software Assurance once Volume Licensing is in effect.  SoftGrid for Terminal Services will continue to be sold as a perpetual CAL, but will be eligible for Software Assurance starting January 1st, 2007.

Microsoft SoftGrid - Enables you to deploy software applications that are never installed to minimize regression testing, yet follow users anywhere, on demand. It turns Windows applications into centrally managed virtual services that are delivered to any desktop or laptop client worldwide. It can also be integrated and managed within Microsoft SMS.
Microsoft Asset Inventory Service - Reduces application management lifecycle TCO through advanced software inventory scanning and by translating inventory data for more than 430,000 titles into useful, admin-friendly information. The tool is an easily administered, hosted service with no client installation.
Microsoft Advanced Group Policy Management - Helps IT take control of the desktop through effective change management and roll-backs via GPOs and a robust role-based administration and delegation model.
Microsoft Diagnostics and Recovery Toolset - Allows you to quickly repair unbootable or locked-out systems, restore lost data, remove malware from infected systems while the system is safely offline using existing antivirus software, and diagnose system and network issues.