While you can’t get this unless you are an OEM, this should give you some insight into what to expect with SCCM 2007 when you are making and prepping your images.  You do use OSD right?

Here are some of the new features of WinPE 2.0

Ability to boot WindowsPE into RAM from WIM Image
Driver injection into WindowsPE Images
"Hot" PnP Support for WindowsPE
32-MB RAM Drive (writable scratch space)
New/additional optional components
New Launch Tool Called Wpeinit
New Build Tool Called PEImg
New Image Maintenance Tool -- Package Manager

Here are some of the features included in the OEM Preinstall Kit (OPK)

Creation of the Windows System Image Manager Tool to author answer files
Inclusion of full end-to-end suite of preinstallation tools, including image creation and maintenance
Sysprep is now included in the operating system

Anthony Clendenen

Source bink.nu

The Windows Vista Release Candidate 1 (RC1) OEM Presinstallation Kit is now available. Microsoft's Worldwide System Builder team would like system builders to experience the updated OEM Preinstallation Kit (OPK) tools which will be used to preinstall Windows Vista. 

Updated Windows Vista RC1 OPK and WindowsPE Features 
 
The Windows Vista RC1 OPK includes the Windows Preinstallation Environment 2.0.
New features in WindowsPE 2.0 include:

Microsoft-provided imaging tool, ImageX, used for creation and deployment of images
Ability to boot WindowsPE into RAM from WIM Image
Driver injection into WindowsPE Images
"Hot" PnP Support for WindowsPE
32-MB RAM Drive (writable scratch space)
New/additional optional components
New Launch Tool Called Wpeinit
New Build Tool Called PEImg
New Image Maintenance Tool -- Package Manager
New features in the OEM Preinstallation Kit (OPK) include:
Creation of the Windows System Image Manager Tool to author answer files
Inclusion of full end-to-end suite of preinstallation tools, including image creation and maintenance
Sysprep is now included in the operating system
Full support for the Windows Deployment Services, the successor to Windows Remote Installation Services (RIS) 
 
Download Windows Vista RC1 OPK (English version) at source.\

NOTE: you need to subscriber from MS OEM systembuilder site

Additional languages of the OPK will be posted once the product is released in 2007.