I saw these "preview screens" of the new 2007 Ferrari, and honestly I doubt that is possible to prepare in only few days, from the official launch of the new real car, a good definitive model for GP4.
Ferrari team just presented the new car with "old" wings, and there are not yet available good photographs of many particulars....
Furthermore, with all respect for the work of Forum friends like E-Schumy and dark21a, their models are clearly cars derived from the 2005 Ferrari by Enzojz, modified to resemble the 248, and then now the 2007 version.
If they had prepared a new car from scratch, I think that now they were not here to show these previews.
I'm still waiting to publish my Ferrari 248, since I spent almost one year ( in terms of time...of course not working everyday, and many hours a day ) to make a detailed car, with proportionated size, realistic shape and position of particulars, etc.....and i think it's difficult, if not impossible to prepare a good quality GP4 car in few days.
Therefore, if we want to speack of GP4 cars, arranged ( although well prepared ) in few time to be used quickly in the game, updated to 2007, I can understand their release....But if You want to speack of detailed, and original models for Gp4, well...be patient, and give time to people that are creating models from their work, and not from that of others.
With all respect of shapers using as base of works that of other Authors.