According to Cyberpunk 2077's lead quest designer Pawel Sasko, players will be able to get already customised vehicles but will not have an option to customise rides themselves.
Cyberpunk 2077: New Gameplay, More Details on Lifepaths, Number of Endings, Romance Options & Next-Gen Versions - IGN
Cyberpunk 2077's lead quest designer Pawel Sasko joined us to give us some details on CD Projekt Red's massively anticpated open-world RPG. He explains how the lifepath a player selects for V will affect where their campaign begins in Night City, which questlines will be available, and how such...
I don't know if this was mentioned yet but this came as news to me.
Bit of a bummer, I never expected NFS:Underground levels of customization but I was looking forward to at least changing the paintjob to my liking on my bikes and cars
Maybe an idea for future DLCs like they added the die system to the armors in TW3.