This is just an announcement for Amapi, no side-grades etc are mentioned. I'd re-register Carrara & see if you get a "special offer". As I recall, Antoine wasn't sure if they would incorporate some of the modelers into C as a plug-in and/or merge the rendering engine & shaders into Amapi as a plug-in. I'd still wait awhile, unless you want to learn a whole new program, UI & spend a few C-notes.