The powerpoints below allow you to build your own presentation, pulling just the slides you need.
The Project Tasks spreadsheet is useful for demonstrating creation of an application from a spreadsheet together with Interactive Report functionality.
Application Express in Oracle Database 12c Multitenant Architecture
This presentation provides an overview of Oracle Database 12c Multitenant Architecture. It then outlines the various deployment and migration options for Application Express.
The final section covers Oracle Database 12c new features that may be important to Application Express developers. A PDF file is also available.