People talking about "GTA clone". Only because they want a programmer for Vehicles, that doesn't mean it will be a gta clone, same as Witcher 3 is not a Skyrim copy, because both games had horses....
It does not, but open world with vehicles tends to end up in simmiliar space structure to GTA series which give simmiliar feel. Watch_Dogs is not GTA clone, but it kinda is. Saints Row 3 is not GTA clone, but it kinda is. Sleeping Dogs is not GTA clone, but it kinda is. What makes them kinda GTA clones is the city. Verticality, flying cars and setting far from being modern make it feel different anyway, but issue of low desity of meaningfull narrative content per square kilometer will be very low. Personally i would opt for Deus Ex level of narrative content density rather than GTA level of density and fact that we will have open world which most likely will need cars for efficient traveling (unless vechiles will be used only for missions outside the open hub space) will have low narrative content density. Roach is significantly slower than a car on flat road, so world could be smaller. TW3 didn't had big issues with narrative content density (still they were there), but had huge issue with quality of them. Those problems might be worse in CP2077. Hiring more people is easy, hiring more veteran storytelling nijas is hard AF.
I mean, CDPR wants to improve their games further and not give us "worse" games, so it`s quite clear that we might get "Roach 2.0" with our car/ship/...
The thing is that i might like a "worse" game more. More features doesn't mean better game. As saying goes - "The perfection is not when you can't add anything more, but when you can't take anything out". Game is made of connected systems. Adding one can negatively influence others. Unless it is completely separate system, but then it is just filler feature.
HOWEVER it doesn't need to be a travel possiblity for us! Maybe they just need AI cars, because Cities in 2077 without Cars/ships wouldn't be real cities, right?
"Creating the whole architecture of vehicle related code and the physics of driving / flying in those vehicles."
If it was for AI, then they would look for AI programmers, not for vehicle driving physics programmers. Vehicle AI tends to ignore some physics rules even in some racing games, not mentioning the situation where they are just background.
As i said before. It might be just for missions and quests outside of main hubs, but possibility of that being the case is rather small considering that game will be open world, not hub based.