I definitely try the "crystal ball" approach when I view a new catalog, and although I don't 100% buy an item because I think it will be desirable in the future, I must admit that I do factor that component in with a new purchase.
So, Chris, I completely agree with the Christmas E8 set for two reasons:
1) It's gorgeous! I can imagine the set racing on a snowy layout with blue lighting.
2) Its high price will ultimately deter some buyers given that it is a fictional/seasonal offering
I also believe the add-on passenger cars for the AC&W set will be highly collectible due to the success of the F9s; I'm not quite sure about the AC&W E8s yet - time will tell.
As we have seen with multiple SKUs on high dollar items (The GS series, etc.) some of the Dreyfuss variations are going to be quite difficult to attain in the future if not pre-ordered.
Lastly, I think the Kyle and Kansas City Terminal GP20s, if executed properly, will be sought after in the future.