Re: Data viz push
It's a fine point, but there's a difference between drillable and interactive. With drillable functionality you can go from a visualization to the underlying data. With interactive visualization, you can pick subsets of data from within a visualization and rerender the graphic, or you can change filters to visualize a larger, smaller or somehow different data set. Salesforce is supporting the former in this case, but not the latter (at least not that they've discussed).
Interactive data visualization on mobile devices is pretty advanced and something you would get from a dedicated data-viz/analysis platform like Qliktech, Tableau or one of the many imitative data-discovery modules from big business intelligence vendors.