Update 13th January 2015:
I updated the sample to the new Xamarin.iOS Unified APIs which are required for 64 bits support. See the related blog post here
The Xamarin team did it! My talk (and all the other Xamarin Evolve talks) are available in video for your viewing pleasure.
The talk can be seen here:
(make sure to select HD video for a better experience).
I also uploaded my slides on OneDrive:
Finally, see this blog post for information about the MVVM Light Toolkit V5 (with Xamarin support) and the source code is also available for download.