Straight from www.vtec.net:
"One of our observant readers in Europe saw some new NSX design sketches on a French automotive blog and notified us. A quick search of the European Patent Office shows that Honda filed a set of six wireframe sketches of an open-roof NSX on 22nd February, along with the more traditional 3D renderings of the fixed roof version. As you can see the drop-top looks pretty much identical to the Avengers NSX. See all 12 images below."