Thanks for the informative presentation. I have three questions.
1. Can we have the source code of this presentation
2. When will be able to start writing Universal Projects (i.e when will we have the VS update)
3. I think that upgrading WP8 project to WP8.1 project is easy but. Making it a Universal app looks like rewriting most of the code, because Navigation, Pages etc.. pretty much everything is not supported by W8.1. Am I correct on this?