Ответ прост --- на MSDN:

Основная страница -

Microsoft Dynamics NAV 2013 Beta
http://msdn.microsoft.com/en-us/library/hh173988(v=nav.70).aspx

Три обзорные страницы -

Microsoft Dynamics NAV 2013 Requirements
http://msdn.microsoft.com/en-us/library/dd301054(v=nav.70).aspx

What's New: Developer and IT Pro Changes for Microsoft Dynamics NAV 2013
http://msdn.microsoft.com/en-us/library/hh174007(v=nav.70).aspx

What's New: Application Changes for Microsoft Dynamics NAV 2013 Beta
http://msdn.microsoft.com/en-us/library/hh173994(v=nav.70).aspx