Only thing I found little strange on the demo was actual animation (especially hair) and the touted scarf which were being told it's moving very naturally, but didn't seem that natrual at all, never getting in the way of the player. Other than that - I thought it was awesome - especially the flying scene, which probably involved huge amount of data load in, hence the power of SSD.
But after all, it's a tech demo. Remembering the PS2 Tech Demos and all (which basically killed Dreamcast hype for a lot of people - to wait for the PS2), as well as Unreal Engine being pretty much universal engine for all major platforms - I'm sure XSX would handle it just as well, if not better with faster CPU and more plentiful CUDA units.
Perhaps super speed SSDs may be a must have in order to play a game in the future - unlike console gamers, PC gamers are more likely to put big bucks on their rigs, so maybe that's the case... but I think that's really pushing it too far. In the end, Developers would have to look at and also think about the players with moderate setups and all.