GeoIP plugin was providing a widget where it was possible to see the countries visitors, if the country was clicked it would show the cites.
Since GeoIP became included at Piwik 1.9, it only provides a widget per country or city.
Are you planning in future versions to have that GeoIP plugin widget back?
Good news: GeoIP is now integrated in Piwik, enabling Accurate Visitors Geolocation in your Analytics reports. To enable GeoIP go to the Settings > Geolocation admin page, and follow the short instructions.
You can also get an even more accurate Country & City Database from here to enjoy top accuracy in detecting your visitors locations.
See also the documentation about Geolocation - Analytics Reports in Piwik.