Good overviews of recent events:
http://www.bbc.com/news/world-africa-34321961
http://allafrica.com/stories/201509220499.html
Two very thorough blog posts which go into more of the background and socio-political context leading up to the coup:
http://www.washingtonpost.com/blogs/monkey-cage/wp/2015/09/21/can-burkina-faso-africas-most-coup-prone-state-become-a-stable-democracy/
http://african-politics.blogspot.com/2015/09/burkina-faso-army-orders-coup-leaders.html