Autodesk has released the 2014 products. Unfortunately, they have not updated the simulation trial versions as of this writing (July 2013).
You can find more information on the Autodesk Simulation products here.
At this time, only a single simulation product is available as a trial version, this is Autodesk® Robot™ Structural Analysis Professional. While this could be a very interesting product for some, it is not mechanical, multi-physics simulation product.
We'll keep you updated as we become aware of additions to the Autodesk trial download versions.
Download the Autodesk Simulation Mechanical and Multiphysics 2013 free trial version.
For more information on Autodesk Simulation Mechanical and Multiphysics 2013, visit the CADplace product pages.