It's offically a new country.
http://www.bbc.co.uk/news/world-africa-14089843
Their govenrment lists some maps as well.
http://www.goss-online.org/magnoliaPublic/en/states.html
Also, wikimapia seems to have the state boundaries which make up the new country.
http://www.wikimapia.org/#lat=9.7740246&lon=28.7402344&z=6&l=0&m=w
Discussion
Comment from Sanderd17 on 9 July 2011 at 14:05
And the border is on OSM too: osm.org/browse/way/120917329