just googled that there think your right
May 7, 2010
Last year, Microsoft said that customers could downgrade new machines purchased with Windows 7 Professional to the older Windows XP Professional for a limited period. The deal ends 18 months after the introduction of Windows 7 -- in other words, in late April 2011 -- or when Microsoft launches Windows 7 Service Pack 1 (SP1), whichever comes first."