The more salient point is that US carriers just don't do the undisclosed order thing. They'll announce the mainline carrier and let the regionals squabble over it at the least.
Thinking that these have any reasonable chance of going to a US carrier is setting yourself up for disappointment.
I heard from some buddies who started doing contract instructing on the CRJ at CAE these planes are heading to Garuda to join their CRJ1000 fleet.
Just as 80kts said US airlines don't do undisclosed orders.