SOFA fallout...?

While everyone seems to focus on Baghdad it seems the Kurds in N. Iraq are preparing to challenge the limits of their autonomy. I'm hoping (and relying on some semblance of residual Iraqi nationalism) that some commentators' worries are wrong and that once US troops are drawing down, as per the SOFA passed just last week in the parliament, it doesn't turn into a Sunni-Shi'ite-Kurd "free for all". But his worry is well taken when you have a disgruntled Sadr movement and upset Sistani deputies; you see Kurds arming themselves with planeloads of weapons from Bulgaria, outside of the scope of the Ministry of Defense (aka. the central government); and Sunni discontent with their minority influence.