No, NFS: Ferrari (which is still rumors) and NFS: Motor City (which is supposed to be released early next year) is completely different.
Cars in Motor City are 50s - 60s Muscle Cars.
Btw, I like Need for Speed series, even though the realism is not perfect ( or quite far from reality because they mixed between simulation and arcade), but NFSs series are the best compares the other racing cars simulations.
FYI, I have collections all Need 4 Speed series, from NFS 1 (Road & Track), NFS 1 SE, NFS 2, NFS 2 SE, NFS 3, NFS 4, and now NFS Porsche Unleashed.
I disagree have u ever played Sports Car GT it is the most realistic game out there and it looks just as good as any of the NFSs. I just feel it would be bad if they made a need for speed Ferrari it is just as bad as when they came out with need for speed Porsche!