We've announced some new requirements for hardware supporting XPS and WSD.  Specifically we are giving 1 year additional time for vendors to implement XPS and WSD before requiring those technologies in order to receive a Windows Premium Logo. 

Here is the specific text captured from our latest newsletter that went out a few days ago:

Microsoft is updating the Premium Logo Program requirements for Microsoft Windows Vista after carefully reviewing the product schedules and marketing drive. The new document that contains these changes is Version 3.03 of the Windows Logo Program Device Requirements for Windows Vista Client and Windows Server code named "Longhorn" will be available for download at http://www.microsoft.com/whdc/winlogo/hwrequirements.mspx on July 17.

The changes made in the Printing and Imaging Devices section of the requirements document are:

IMAGING-0004: Any network-connected device that supports Windows network-connected Web Services for Devices (WSD) must implement WSD properly for their device type
This has been changed from a mandatory requirement for the Premium Logo to an "if implemented" requirement. On July 1, 2007, this will return to a mandatory requirement for the Premium Logo.
IMAGING-0010: Printer driver correctly implements XPSDrv printer driver architecture
This has be changed from a mandatory requirement for the Premium Logo to an "if implemented" requirement. On July 1, 2007, this will return to a mandatory requirement for the Premium Logo.

All other printing and imaging requirements remain unchanged.
For scanners, one of the requirements to receive a Certified for Windows Vista logo is for the scanner to meet the criteria of DEVFUND-0019, Devices that support Windows color quality initiatives meet Delta E tolerances. See Version 3.03 of the Windows Logo Program Device Requirements for Windows Vista Client and Windows Server code named "Longhorn" for the most up-to-date Windows Logo requirements.