We have ended our UI Technology Preview for Autodesk Inventor. On Friday I updated the Autodesk Labs site to remove this technology preview.
Thanks to everyone for the great feedback we received with regard to a new user interface for mechanical design. Without question, your feedback will be considered in planning future uses of this technology.
For those who wish to continue to be involved with future releases of Autodesk Inventor, please register with http://myfeedback.autodesk.com.