I don't know how likely the Kurds are to join up.
Khilizad is spending his last days as ambassador to Iraq in Kurdistan lobbying the Kurdish parties to join Allawi's list. Khilizad lost all faith in Maliki several months ago and believes he is too week and indebted to Sadr and Iran to lead Iraq.
As to whether or not they'll join this coalition I can't say. But I have read that the Kurdish government knows they can't make it by themselves, that they need Baghdad, and Baghdad really need the stability that the Kurds have.
So we'll see what happens.