Went to Wal-Marts and saw the XboxOne demo, the unit wasn't to big so self space won't be a problem, the Kinetic 2 bar looked thicker then the old ones----but the main part where the graphics.
Although I didn't get to play it (no controller yet), I looked at some gameplay and well...it was smoother but nothing ground breaking or mind blowing. Then again it was a demo for a racing game but still.
Even though it's still young the XB1 games looks like it will run smoother and have some wow factor but nothing mind blowing.