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. .NET developers who are familiar with Visual Studio .NET will be comfortable with developing Dynamics AX applications although Dynamics AX has its own IDE which called MorphX and its own programming language with is X++.
Check out the complete details on his blog post here.