Thank you for responding, Jesla and Dave. I've been thinking that I'm the only person on the boards who cared if the white racing cars have racing drivers for repaints.
Dave, I hear your circumstantial arguments, but here are some of my mine to suggest that they will have street drivers:
1. The White Cougar has rear street exhausts, unlike the Gurney car.
2. The white one has a big street side mirror, unlike the small racing ones on the Gurney car.
3. The white car is advertised as having headlights and taillights, unlike the Gurney car.
4. The driver's hands appear to be bare in the street car (although you can't see his head).
5. If the murky picture suggests a black helmet, which would be "right" for a Gurney car, why is it not black in the actual painted Gurney car? (I think they make their white kits "all white" now anyway)
6. It appears to be apparent from Scaley's promotional shots that the Challenger white car clearly has a street driver:

7. The white Charger that they released earlier also had a street driver.
I will bet they both have street drivers, which stymies any advantages I would want to have to buy them to repaint and add to my racing field, and I don't know why Scalextric thought it was a good idea to put street drivers in them (by the way, they did put a racing driver in the white Volkswagen(!)).
Of course, Scalextric may fool all of us with bogus early promotional shots, and look totally different when we get them (i.e., see the Dodge Charger Daytona), and I have not been able to find out from any retailer or anyone else in the field about this issue. I bought them "blind" from Power Slot Cars online today, because I heard they were going fast, but this was the car I have been waiting for all year, and I hate to buy uninformed, particularly when I have tried to do my "due diligence" online beforehand.