He lightly touched on what IoC is, in the context of how Caliburn.Micro uses it. He then went on to show some demos of Caliburn.Micro. He demonstrated how a XAML page can be created which binds to a ViewModel, without requiring any "UI glue code" to stick it all together. It made for a simple application that had a higher percentage of the code being business logic, rather than scaffolding.
A recording of the talk can be found below