Well, they were quick to deliver and now it is official. DevExpress is supporting Delphi 2010 and it is available for download to all their license holders.
The new Express Install, v1.46 includes full support for Delphi 2010 and C++ Builder 2010 to the following VCL components:
ExpressBars v6 and Docking Library
ExpressPrinting System v3
Very good news indeed, Enjoy!