Full integration seams to be the most popular option but there is a hell of a lot of work to go through to make the deal right for everyone involved.
As for routes who knows but I'm fairly sure the middle eastern routes will be kept and prob if possible put on a bigger aircraft one that can be nicely filled up with cargo because from what I here those airbus are operating out of there at max RTOW with cargo that's where the money is on the routes not so much the pax.
Let the fun begin.