I would wager that the concept art we have seen is going to be very close to the final version. The concept art Universal tends to release is usually very accurate.
For reference here is Diagon Alley concept art:
Here is the actual land:
But the image does not look like concept art ... looks something people photoshoped poorly to have something to show.
The people are photoshoped, the yoshis are in diferent resolution and there is a weird photoshop default paint effect in some parts
What you posted is something actual artists drew from ground up