[Tamar]

That Ferrari looks very tail high. Presumably just to get the maximum track but it would look a lot better with the rear wheels just inside the arches.

If you compare the side shots of the #34 Pilot and # 59 Unisys cars its more like the Pilot has the body straight and level..and they dropped the nose on the #59 (and as such raised the tail).
The F40 is their first new GT release after the F333SP and Toyota GT-one (both LMP and GTP) and by the looks of it will be released stock with the 12mm wide rear wheels.
(previous GT's came with 11mm wide wheels).
So depending on how scale accurate RevoSlot has cast its F40, it should be 62mm wide (about the same width as the Viper) so with narrow(er) wheels you should be able to tuck them inside the arches.

I am unsure what it is, but I keep looking at the pics of the revoslot model and thinking it looks "stumpy" from the side on view, but I cant put my finger on why...

 I also would agree on the Unisys image, but these are pre production/promotion shots taken with different camera lenses and as such can result in different levels  of "distortion of proportions". Well have to wait and see..till their can be held in the hand.

With kind regards
Tamar