Xamarin aquisition by microsoft

Question

For investment reasons, I would like to know when will xamarin be integrated in visual studio, and will it be open-source or a paid service. 'till now xamarin seems to be the best way for cross-platform but it needs investment by me and don't know what to do, for now I'm keeping android google studio, but would prefer visual studio if there were more resources to learn xamarin and all android devices capabilities/compatibilities...