Jalopnik is also in doubt.I doubt Toyota would include pictures of the final production car in an email when it's so close to the official reveal.
Closer inspection of the images show some finer details are missing/different when you compare them to the leaked images of the front and rear.
The background is also quite simular to that of the GR concept images which was used as a background for earlier renders.
It seems as though the recent details of rear diffuser etc has been photoshopped onto earlier renders.
Just my 2 cents but I'm a bit sceptical.
I'd love to be proven wrong though...