I'll be pissed if they don't add prestige.
Now I'm not saying prestige mode is God or anything, but creating a whole new account is boring just to level up to 55 again in CoD4.
Anyway,
Vehicles: If they add these..... /wrists
Losing the Skorp: /wrists
Fixing G3 (if they include it): Hotness
Fixing Melee: I will jump off a cliff if IW asks me to.
I don't have high hopes for MW2. I think MW2 is going to fail in comparison to CoD4.
Either way, I will be definitely getting this one in the Special Edition when/if I hear good things about it.