"The rebels agree to lay down their arms and negotiate ..." is almost always good news.
In today's good news, the M23 rebel group in Congo were the ones stopping their war. The government of the Congo will negotiate to achieve the rebels' reintegration into society.
The Congolese government was backed by UN troops who, unusually, were sent there to fight. The rebels' main outside supporters, the government of Rwanda, also accepted the peace deal.
This is not the end of fighting in the eastern Congo - several other rebel groups and gangs remain. But today's good news sets an excellent precedent for creating lawful order in one of the most lawless places on earth.