You probably could not make it to Magnus's presentation about Wikidata. That is the sad news. The good news is that the slides of his talk are available for all of us to see.
The presentation is well structured, it explains clearly what Wikidata is about and the tools ecosystem gets its attention. When you present, you have to fit the information in the allotted time frame; it follows that there is more to show, more to explain. Much of this can be found by reading Magnus's blog. In addition to this there is always this blog. As always, questions remarks suggestions are very welcome.