If its approved by DOJ in late Q3 as they hope, I would look for some reciprocal perks between the two programs in 2014, including possibly earning preferred miles by flying either airline towards 2015 status.
That should happen within weeks of the merger closing. Once US slaps its code on every AA flight, and vice versa. However, the reciprocol flight benefits probably won't occur until the 2014 program year. I suspect the US and AA FF programs will start to mirror the other. And we should then get the indication of whether UDU or e500s is going to be the upgrade method in the combined program.