I know they literately get thousands of proposals that they have to go through and select the ones they feel best suite their audience. I wont tell you how many times I've submitted (excellent) session proposals to AU with no luck! Finally last year I got in, but only as a co-speaker thanks to my friend Justin James of Reach Consulting. We did a fantastic job last year on Justin's session BM7557 - Real Revit set up and its partnership with a BIM Execution Plan
If your going to submit a proposal here are some key topics AU are looking for are:
· Building Information Modeling (BIM) (Duh!)
· 3D printing
· Cloud services
· Reality computing
· Fabrication for AEC
· Advanced manufacturing techniques
Theyre also looking for classes that focus on Autodesk software like Fusion 360, Revit, BIM 360, 3ds Max, Maya, AutoCAD products, and the range of other Autodesk products that support industries from infrastructure to entertainment. Check out last year's classes to get an idea of what type of sessions they're looking for.
Hope to see you at AU 2015!