I would hope for Northrop-Grumman, myself. They have as much stealth expertise as Lockheed-Martin and they also have a fair bit of radar and avionics experience, supplying a number of systems to the F-35 in addition to the structural portions they produce. Without going into detail, I will note that they have mastered certain stealth manufacturing technologies ahead of others.
nothing major besides talks now going to 3 US companies. Northrop, Boeing and Lockmart.
no idea if its consultation with all 3, or if it will be some kind of competition and one partner will be chosen.
I personally hope it would be Boeing or Northrop just so we can see a more unique design since everyone and their pet dog is making something F-22 looking these days.