Will the game be different on xbox, ps3 and the pc??
Not like story or gameplay differences, but the looks.
I preordered the collects' edition on xbox and i cant wait!
But will it look worse on xbox???
Compared to a basic non-gaming computer the console will look better (on a 720p+ tv) but compared to a good gaming rig the console won't.
The current gen of consoles are low cost and give you good gaming hardware for the price but the PC wins if you have the money.
An example of how a good gaming PC plays Fallout better than a console:
On my PC I run the game at 1080p with max settings on for everything with the option to go 2560x1600 is I wasn't so poor. This means out of the box it looks better than the console. I downloaded the Fallout 3 high def texture packs making walls, doors, roads and other things look super detailed. I downloaded other mods to increase the visual detail of the game further then tweaked the .ini settings to greatly increase the quality of shadows, trees, grass, water and everything else I could find. I increased the viewable distance by a large margin so I can see detailed cities, trees, landscapes and buildings that are far off in the distance. I also use a great audio card with a good set of AKG headphones which beats any factory TV audio to shame, that means I hear more sounds too. The end result is the game feels real on my gaming PC, more than on my flat mate's console.
[edited to fix a grammar mistake]