Well, I bought RoF on the release day like I will do with CoD - and I have every RoF plane in my Hangar and will keep it that way when more arrive
One thing to remember though is that RoF was rather buggy to when released - and there was no use pointing finger at that. I for sure kept quiet about it even though it hurt as we could all see the potential. For me it was in version 1.08 (long time ago) that I really felt that it was showing all of it's potential. As it is now it is a great game, even though my rig is unfortunately too old for it. Have been waiting to upgrade for CoD so I have my finger on the order button for a new rig now
I remember doing the same for IL2 on the first release and I remember it ran great on my blistering fast Geforce 2 Ultra
So, there will probably be a lot of bugs in CoD and they will in the same way as for RoF be squashed - be sure! Pointing finger at them on the pre release day before even applying the first patch will do the community no good!
It sure will require top notch hardware just as IL2 did and RoF, that is just the way it works in the most demanding of genres... I can imagine that the guys at SpeedTree have been working hard to get zillions of trees working at the same time from 5000 meters over Dover. It's easy to say "they look great in Call of Duty so why not in CoD?". They show a couple of hundred in one frame though at maximum...