From this link
http://ketiv.com/support/tech-tips/what-subscription-customers-need-to-know-about-2012-product-releaseMight be close to actual dates?
March 24, 2011 AutoCAD 2012
AutoCAD LT 2012
AutoCAD Electrical 2012
AutoCAD Mechanical 2012
Autodesk Inventor 2012
Autodesk Inventor LT 2012
Autodesk Alias 2012
Autodesk Inventor Publisher 2012
Autodesk Moldflow 2012
Autodesk Simulation (Algor) 2012
Autodesk Vault 2012
AutoCAD Architecture 2012
AutoCAD MEP 2012
March 29, 2011 AutoCAD Map 3D 2012 (Combines Map 3D and Topobase Client )
Autodesk Infrastructure Map Server 2012 (Combines Autodesk MapGuide Enterprise and Autodesk Topobase Web)
April 11, 2011 AutoCAD Revit Architecture Suite 2012
AutoCAD Revit MEP Suite 2012
AutoCAD Revit Structure Suite 2012
AutoCAD Structural Detailing 2012
Autodesk Quantity Takeoff 2012
Autodesk Revit Architecture 2012
Autodesk Revit MEP 2012
Autodesk Revit Structure 2012
Autodesk Navisworks Family 2012 (Freedom, Manage, Simulate)
April 14, 2011 Autodesk Product Design Suites 2012
Autodesk Factory Design Suites 2012
Autodesk Building Design Suite 2012
April 15, 2011 AutoCAD Civil 3D 2012
April 16, 2011 Autodesk Constructware 2012
April 23, 2011 Autodesk Buzzsaw 2012