Migair,
I agree with you on all but AA jumping into the HKG market from DFW. I very much doubt AA is looking to expand into CX territory at the moment with all the merger stuff going on. They would be very grateful if CX ran the route though so they could carry the Oneworld connections to Central and South America from DFW.
I think the announcement will be EWR (yes, much more convenient from much of Manhattan's west side and the Jersey suburbs). My guess is that SEA and BOS will be next on the list with a possibly shuttle between SEA and DFW for AA feed southbound.