My guess:

20's or smaller all around, instead of 20F, 21R
different taillight. The one massive LED taillight taking up the entire trunk looked awesome though.
I guess the seats will be similar, but the gauges will be a little different. hopefully that computer gauge will make it to production.

The spy shots make me think at least the proportions will be the same, so hopefully the road-going version will be faithful to the concept. It's not like the concept was made out of moon rocks; there wasn't much that was obviously never going to make it to production.