You can present offline using the preview window, or you can record a movie. However, its not possible to export an offline web preview, if that's what you are asking. Please let me know if you have additional questions!
Do you know if offline web preview is on the roadmap for the final product? My org would never allow us to use an outside web service (secured or otherwise) to publish previews of work-in-progress, and being able to distribute a browser-based preview internally would be critical.