According to the AAdvantage newsletter, STL-YVR is being planned to start in the next few months.
All in all though, I agree with most of the above. LGW will probably stay, but I think the biggest aircraft in masses will be the 757.
I think STL's international flights will be into Mexico and Canada with probably the daily LGW flight. I do however think that some of DFW and ORD's domestic flights will be transferred to STL.
Give me a break, I created this username when I was a kid...