Microsoft Project Professional 2010 and Microsoft Project Server 2010 are all available for download as part of the 2010 Public Beta availability (alongside SharePoint 2010 and Office 2010 applications):
repost from christophe blog

Public Beta is available for the following languages: Chinese (Simplified), English, French, German, Japanese, Russian and Spanish

239 MB

22 MB, and remember you need to install SharePoint Enterprise 2010

561 MB

Please get the bits and test it out but read carefully the expectations from a deployment point of view, read up on TechNet about Public Beta limitations: