Well, I've got the Hitman edition on pre-order. But I suspect the Viper/Hitman/Lord of Darkness covers will be slip-over covers for the main game box, which will have the standard European cover on them. I actually prefer the US one because its got The Miz on it, and he's the main reason to watch the WWE right now.
But TBH, once I've got the game, its not coming out fo the 360 for months, so who cares what box its in? ;0)