C’est annoncé ici : Announcing SharePoint Server 2010 Preliminary System Requirements _us

    1. SharePoint Server 2010 will be 64-bit only.
    2. SharePoint Server 2010 will require 64-bit Windows Server 2008 or 64-bit Windows Server 2008 R2.
    3. SharePoint Server 2010 will require 64-bit SQL Server 2008 or 64-bit SQL Server 2005.

image