If you're looking for the list of new features in Microsoft App-V 4.5 then you can find it here.  The list has actually been published for a little while but some folks have missed it so I thought it was worth a mention here.  The link covers the following topics:

• Memory Locked Cache
• Unattended Application Pre-Cache
• Auto-caching
• Granular Client Configuration
• Real-time Monitoring and End-User Session Control
• Application Check-pointing
• Offline Application Usage Metering
• Dynamic Suite Composition
• Product Available in 11 new languages
• Accessibility
• HTTP Streaming
• Enhanced Sequencing
• MSI Package Generation