A very nice and detailed post by Amer Atiyah, he is a freelancer Microsoft Dynamics AX Solution Architect and manages AX blog on his website . He has detailed the usage of Viusal studio .NET with the new Dynamics AX 2012. Developing applications is now made easier and faster in the new Microsoft Dynamics AX 2012 than its earlier versions

More:
Visual Studio .NET Usage With The New Microsoft Dynamics AX 2012