I'm not sure. I think it has more to do with their overall strategy.
They are one step from throwing Iraq into an absolute bloodbath. (It is far worse in Iraq than is being portrayed) That would draw Jordan, Syria, and Saudi into the civil war and possibly destabilize their regimes (ending what they see as the legacy of Sykes-Picot).
I think they just set up the Shura Council in Iraq a couple weeks ago. UBL talked 3-4 years ago about setting that up at some point but never did.
Once you succeed in destabilizing the entire region, the western front of the regional battlefield becomes the Jordan River.
Timing.
Yep, timing.
And so we wait and watch.