Thanks for the clarification.
Fusion is designed to place data at the center of the workflow. As such, your data is stored in the cloud where anyone you wish to share with can access the same data. This cuts down on duplication and data loss.
So no, 3D pdf output is not supported currently. Instead you can get a much more rich and connected experience by sharing a link to your design. This link shows a web view of your design that includes a 3D preview (much like what you want from 3D pdf), but also includes far more information including comments and real time connectivity, that are all kept on one data set.
From the data panel inside Fusion:


This is the web view:

In the first image at the top, you might also notice that you can have a live review session hosted directly inside Fusion. This opens a real-time 3D session over the web between you and whoever has the link.
In both of these cases the consumer of your output only needs a web browser and Chrome or Firefox.
As far as other ways to output from Fusion:
- 2D drawings of your designs can be downloaded as PDF or DWG.
- Sketches can be output as DXF.
- The model can be output as STEP/SAT/IGES/Fusion/STLetc.
- Animations can be output as AVI.
- Designs can be sent directly to 3D printing.
- Renderings can be output as images.
Please let us know if any of this helps or you have any more questions. Let us know how it goes!
Thanks,
Phil Eichmiller
Software Engineer
Quality Assurance
Autodesk, Inc.