Obviously it would be the level design artwork...
And even it if is empty, if the scale was there, that's all you'd need.
I would hope that they would be able to work back in the same realism from AO. I mean, so that jumping isn't flea-like and One hit kills. It would be difficult without flick screen and more than two directions of attack, but I think something could be done.
The biggest issue I see is pleasing the fans who point out that the level maps with landmarks and things that they've produced based on the game play don't match. And you know they exist...
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