In the document 'Hardware Support and Directions for Microsoft Windows Server', Microsoft states that Windows Server Longhorn will be the last 32 bit server operating system.
Well, thats not too bad, eh? 32-bit has been with us ever since WIndows 95. So, if Microsoft maintains a 3-5 year span for Server OS's (2000 to 2003 to 2008), this means somewhere between 2010 and 2013 is purely for 64 bit processing.
Death To 32 bit processing! Long live 64 bits!