Some 100 protesters from the nomadic Arab Messiriya tribe demonstrate in Khartoum, Sudan, on Nov. 28, 2012. The 20th African Union (AU) Summit is set to gather in Addis Ababa, Ethiopia, on Jan. 21, 2013, to discuss measures to leads the Sudans toward peace — including ways to ensure the final status of the hotly-contested region of Abyei.