Since they've placed an order for 36 A330-300's, I think that makes A340-600 is the favourite to replace 742's.
Maybe they will take a closer look at the A346 when it enters service and then decide. Will NW operate RR powered a/c???
The 777-300 is already operated by many airlines as a 747 classic replacement. Are we talking about the -ER because that can only be ordered with GE90's right???
It looks like NW can't get their preferred P&W's for their 742 replacement!!!