More and more former CNDP members seem to be falling out with the government in Kigali. I wrote here previously that some members of the Rwandan security services suspect that the CNDP could be involved in the grenade attacks in Kigali. Several are now hiding in Kampala and Goma, others have been arrested in Rwanda, and some even suggest that Colonel Sultani Makenga, one of the highest-ranking ex-CNDP commanders in the Congolese army, is one of Kigali's suspects.
In an interview with Jeune Afrique (couldn't see it online yet) this week, President Kagame hints as much: When asked who might be behind the grenade attacks, he says that they are still gathering evidence, but that it includes people in the eastern DRC and in South Africa. By which he could of course mean the FDLR, but I think it is more likely that these are people close to Nkunda.